Continuity mistake: I know that Animators re-use backgrounds but it is painfully obvious that when Keitaro and Narusegawa are leaving the exam results posting they walk in a straight line past the same "Ristorante" three times.
...And Spaghetti Sauce - S1-E4
Continuity mistake: When Laura comes to the pub and has sex with one of the guys, she spots the (hidden) video camera at the bar. One moment, it is entirely covered with a cloth. The camera angle changes and it is partly uncovered.
Hear Today, Gone Tomorrow/Double Whammy/Autopsy Turvy - S1-E13
Continuity mistake: Double Whammy: Throughout the scene where Flippy and Nutty are at the shooting game, the teddy bears on the wall constantly change color between shots. (00:11:51 - 00:12:42)
Jane and the Truth Snake - S2-E5
Continuity mistake: When we first see the guys at the pub, Jeff takes a swig of beer and you can see that his glass is almost empty. After a few seconds of conversation, he takes another sip and the amount of drink has significantly increased. (00:06:00)
Dad's Dead - S1-E2
Continuity mistake: In Titus' first flashback, he and Dave sit on a couch in Ken's peripheral vision. When the camera shifts to the "fist cam", the couch is now facing Ken head-on. (00:02:15)