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)
Asobi ja nainoyo gakkou wa - S1-E2
Continuity mistake: When Ranma stutters before Kuno that he's staying at the Tendo's, a foil from one of the defeated fencers appears by the gate. Wasn't there in all the rest of the scene. (00:12:50)
Asobi ja nainoyo gakkou wa - S1-E2
Continuity mistake: When Tatewaki Kuno shows up, the clock tower shows 8:35, when the clock was shown advancing from 30 to 31 when Akane finished the last opponent a moment earlier. (00:10:35)
Asobi ja nainoyo gakkou wa - S1-E2
Continuity mistake: The polo shirt of the guy leaning unconscious against the school gate is pale violet for the greater part of the scene, but orange when Panda rushes in. (00:14:15 - 00:15:20)
Asobi ja nainoyo gakkou wa - S1-E2
Continuity mistake: When Genma wins a bout of midair kicks and knocks him into the pond, the table is empty in the wide shot, while breakfast is ready when Kasumi speaks. (00:02:55)