Kotsuban uranai! Ranma wa nihonichi no oyomesan - S1-E14
Continuity mistake: The altar brought in by Tofu's mother is a big one (Ranma comments as such), but it's much smaller when everyone prays to it a few moments later. (00:03:35)
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 o gekiai! Shintaisou no sukeban toujou - S1-E11
Audio problem: Kodachi is barefoot, but after the part when she jumps over the taxis, her running steps on the asphalt produce a definite sound. (00:20:25)
Ranma o gekiai! Shintaisou no sukeban toujou - S1-E11
Audio problem: Kodachi grabs weapons from her locker and jumps in the night to go deal with Akane. She laughs maniacally but her mouth is shut. (00:07:55)
Kotsuban uranai! Ranma wa nihonichi no oyomesan - S1-E14
Audio problem: In the English dub, Ranma manages to say perfectly "Coward! You take that back!" to P-Chan while he has his teeth gritted. (00:13:45)
Ranma o gekiai! Shintaisou no sukeban toujou - S1-E11
Continuity mistake: When Kodachi gets a faceful of the door, in the shot from the side the hanger with Akane's uniform is missing. (00:23:55)
Onna no koi wa snesouyo! Kakutou shintaisou de iza shoubu - S1-E12
Continuity mistake: When Akane gets up the day of the competition, her sprained ankle is not bandaged. (00:13:35)
Pî pî P-chan Roku na monjanee - S1-E10
Continuity mistake: When Ranma fights the 3 butlers, there's a moment when, attacked by the one with the cane, he parries his hit with the seat of the stool that has the hole in it. On the ground you can see one of the other henchmen with the wrong livery, dressed in black like the head butler and not in the light grey they other 2 are. (00:19:10)
Gakkou wa senjouda! Taiketsu Ryouma vs Ryouga - S1-E8
Plot hole: In his flashback, Ryoga emerges from the sea and faints on the beach of Okinawa. That's quite the big oversight in plot, since Ryoga, as revealed in the following episode, has a curse similar to Ranma's and he would have emerged from the sea in his animal form and not as 'himself'. (00:07:20)
Other mistake: In this series (the first season of Ranma ½, as it is known in western adaptations), the voice actress for female Ranma in the first 6 episodes of the English version (Viz Media) is played by Brigitta Dau, whose name is misspelled as Brigetta Dau in the credits. The ending credits were remade only in episode 11, so she is still credited for 3 episode where she did not appear and Venus Terzo, who took over after her, is uncredited for episodes 7-10.
Akane no shitsuren datte shouganai janai - S1-E6
Continuity mistake: When Akane pulls out of the "cheaseburger" (that's what it looks like the wrapping says) from the WcDonald's bag, the schoolbag next to her is across the seat intersection In the aerial shot later when she is chugging from the straw, the bag is closer, turning at the same distance as the first time when the same camera angle as before is used. (00:11:45)
Akane no shitsuren datte shouganai janai - S1-E6
Continuity mistake: This episode and the previous do not really match well, overalapping in incoherent fashion; in the previous, Tofu was having tea with the kids and had a look at Ranma's wound, and then Akane got upset and was about to leave. In this one, Ranma and Tofu make her stay...by having tea together ("just made tea") and Tofu rips the bandage off Ranma and has a look at his wound.
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
Continuity mistake: Ranma stops by the sumo dude Akane just smashed, and ponders about the craziness of the morning ritual. What follows is a wide shot of the schoolyard with a trail of bodies left behind by Akane distancing her from Ranma, one of the latest being the sumo guy Ranma just stopped by. (00:16:50)
Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Continuity mistake: When Panda Genma KOs Ranma with the street sign, the guy with the green sweater in the background is behind the blue shirted guy in the close-up, but in front of him in the wider shot. The girl next to him has her hand raised in the first, and it's down in the second. (00:03:10)
Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Continuity mistake: At the very beginning, Ranma is in an alley with his/her panda dad. She tosses aside the backpack, and they begin to fight. The fight brings them to the main street. After knocking out her dad, Ranma simply reaches on the ground and grabs the backpack she took off several meters away in a completely different street. (00:02:05 - 00:03:00)
Hone made aishite? Akane koi o fukuzatsu kossetsu - S1-E5
Plot hole: Dr. Tofu is able to tell that Ranma was hit by a softball (he says something about the marks like he actually sees them), but Ranma's wound is still covered by the bandage, that he'll remove in the next episode. This is linked to a larger mistake in the following episode. (00:19:55)
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)
Akane no shitsuren datte shouganai janai - S1-E6
Continuity mistake: Once she has smashed the bricks and leans against the wall, Akane's projected shadow in the close-up does not show the head, while in the wider shot with Ranma's shadow appearing, the head is very visible, at almost the same level as the hand's and close by. (00:20:00)
Asobi ja nainoyo gakkou wa - S1-E2
Continuity mistake: Kuko freaks out in class hearing that Akana is Ranma's fiancée. The clock in class points at 8:05, an impossible time (school begins at 8:30) and dissonant with the time shown by the clocktower in the shot of the rain stopping (which pointed at minute 45). (00:19:10)