Continuity mistake: When the mobsters re-enter Puzzo's Ristorante to see the Warners playing maracas and bongo drums, the front door opens on its own between cuts.
Continuity mistake: Towards the end after Dr. Scratchansniff backs his car out into the road, Yakko tells him about next weekend's date. Then, in between shots, the car parks itself on the sidewalk.
Continuity mistake: When Dr. Scratchansniff storms out from his car and starts bickering with the jockey in a pink convertible nearby, the white painted lines leading up to the Snackaterium space themselves out considerably after a couple of shots.
Of Course You Know, This Means Warners - S1-E269
Continuity mistake: When J. Edgar Hoover pulls up to collect the drum of scrap nylon, Yakko and Dot swap places between shots.