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)
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)
Gakkou wa senjouda! Taiketsu Ryouma vs Ryouga - S1-E8
Continuity mistake: Looking in the close-up at the blackboard saying Study Hall, there's a sun doodled in the upper right corner, so close to the 'cloud' it overlaps. In the wider shot of the room, the sun's distance is far greater. (00:04:50)
Gakkou wa senjouda! Taiketsu Ryouma vs Ryouga - S1-E8
Continuity mistake: The portion of Akane's hair cut by Ryoga's metal belt is much bigger once the hair hits the ground. (00:21:20)