Ore wa otokoda! Ranma chuugoku ni kaeru? - S1-E18
Other mistake: Genma is snoring instead of listening to Ranma, and he punishes him slamming his face into the floor. One of the last images flashing on screen during the KO is Azusa Shiratori the ice skater, a character Ranma has not encountered yet. (00:11:40)
Gekiretsu shoujo Shanpû toujou! Watashi inochi azukemasu - S1-E15
Other mistake: After beating up the dummy, Akane is thinking back about her 'relationship' with Ranma. During her thoughts, the first memory that pops to her mind is something that has not happened yet, Ranma moving in front of her and saying "She's MY fiancee", part of the story arc at the ice rink that will happen only later in the series (Episode 20 of the English dub, which unites both Ranma series in one, episode 8 of the Ranma Ranma ½; Nettô-hen series; "Kikiippatsu! Shiryō no Bonodori"). More recent home video editions have fixed the mistake, airing the ice rink episodes before the Shampoo ones - which is where they should have been in the first place; Shampoo's debut episode was preempted last minute in the original airing to help unsatisfying ratings with the appearance of one of the most popular manga characters. (00:15:50)
Gekiretsu shoujo Shanpû toujou! Watashi inochi azukemasu - S1-E15
Other mistake: The episode opens with Ranma eating an ice cream with Akane. He (in female form) acts as he never had one before and Akane says "Don't tell me you've never had ice cream before!", and that's the case, apparently. But, episode 11 opened exactly with Ranma charming a shop owner into handing "her" a cone, commenting that "when it comes to eating out, being a girl is the only way to go." (00:02:00)
Shanpû no hangeki! Hissatsu shiatsuken wa mimo kokomo ubau - S1-E16
Other mistake: Not getting too deep into the obvious absurdity of the gag (I don't think a prospect husband would be too impressed if you serve him a pig complete with everything, obviously poorly cooked and don't even take off the bandanna/collar it is wearing!), it has to be noted that the bandanna Ryoga is wearing is covered with hibiscus sauce in the first shot, but clean in the following. (00:08:45)
Gekiretsu shoujo Shanpû toujou! Watashi inochi azukemasu - S1-E15
Other mistake: Ranma chased by Shampoo at the end of the episode jumps down from the roof. He leaps at a distance from the wall, and he is supposedly in a rush to escape the pursuit, but Nabiki is able to pour from the kettle on his head when he is close to the wall and not in a rush to move away from that spot. (00:19:20)
Sukeban no me ni namida? Rûru muyou no kakutou shintaisou kecchaku - S1-E13
Other mistake: Throughout the episode, the English translation greatly misses the joke when it comes to the nature of the fight; the referee keeps replying to Akane's protests "The tools she has are legal" or "she is using legal tools", while the real catch in the rules (and correct translation) would be "using tools is legal", which taken literally means that any tool, even the obviously lethal and unplanned ones, are fair to use, anything goes as long as it's a foreign object and not a bodypart.
Ranma daisuki! Sayonara wa iwanaide!! - S1-E17
Other mistake: Ranma offers Shampoo a favour in exchange for the bottle of #119. The bottle nested in her bosom does not have the label anymore on either side. (00:12:15)
Sukeban no me ni namida? Rûru muyou no kakutou shintaisou kecchaku - S1-E13
Other mistake: In the previous episode, Kuno was watching the match from the St. Hebereke stands, which would make sense since he's cheering for their champion, for the first time. In this episode, he's in the Furikan stands, with Ranma's supporters.
Ranma o gekiai! Shintaisou no sukeban toujou - S1-E11
Other mistake: Ranma is paralyzed by Kodachi's poison, to the point that he can't speak or make a sound, but he does change facial expressions several times.
Ranma to Ranma? Gokai ga tomaranai - S1-E4
Other mistake: Nabiki pours a bucket of cold water and then a teapot of hot water over Ranma as he sleeps, but he does not wake up. Some heavy sleeper. Also, all of this somehow leaves just a warm patch under her groin area, leading to the obvious misunderstanding. But her pillow and other half of the futon should be drenched too. (00:09:05)
Ikinari ai no arashi chotto matteyo - S1-E3
Other mistake: Kasumi is untrained and does not possess any particular physical strength, but when Ranma jumpscares her, her bucket of water is flung in the air up so high that it takes several seconds to descend (this part of the scene does not have comical hyberbole overtones). (00:14:50)
Gakkou wa senjouda! Taiketsu Ryouma vs Ryouga - S1-E8
Other mistake: In the establishing shot of the Study Hall one of the girls turning their back to the camera is Akane, recognizable by the yellow ribbon and by the two friends who chat with her. The hair is colored wrong though, pitch black instead of blue-ish. (00:05:00)
Toujou! Eien no mayoigo Ryouga - S1-E7
Other mistake: When Ryoga is told he is in Shikoku, in the windblown view you can see the crowd being more stretched out than when he hightails. Also, the guy with the yellow shirt is drawn with bulging eyes instead of glasses. (00:04:40)
Toujou! Eien no mayoigo Ryouga - S1-E7
Other mistake: The boar breezes through the various buildings in the aerial view, but takes a second to break through the wall of the Japanese traditional house where the two old people are. (00:03:20)
Ikinari ai no arashi chotto matteyo - S1-E3
Other mistake: The opening of this episode retells the ending of the previous with several inconsistencies, including different dialogue and Kuno arriving with 2 buckets and making a lot more clamoring instead of nearly sneaking on Ranma.
Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Other mistake: In the sparring scene, Akane is at punching distance from Ranma, then decides to get serious and tries to hit her with a heavy blow running towards her a few steps, without having moved back. (00:09:45)
Ikinari ai no arashi chotto matteyo - S1-E3
Other mistake: At the beginning of Akane's run through the horny guys at the school entrance, the clock on the tower is missing the hour hand. (00:16:00)
Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Other mistake: When Ranma is battling Genma at the very beginning, she slides into the main road. Behind her is a vending machine for drinks, only, it's marked "DOLINK" (bad transliteration). (00:03:00)
Shanpû no hangeki! Hissatsu shiatsuken wa mimo kokomo ubau - S1-E16
Other mistake: Akane wakes up with the sun already up and getting ready to go to school...when her alarm clock shows it's 5:25. (00:02:00)
Onna no koi wa snesouyo! Kakutou shintaisou de iza shoubu - S1-E12
Other mistake: When Akane and Ranma arrive to Furinkan High, it's 8 past 20. When Kodachi leaves, it's 8:35. 15 minutes is way too long of a time to have passed (and everyone would also be late for lesson). (00:01:50 - 00:04:40)