Continuity mistake: When Dot is about to sing for Beethoven on top of the piano, her microphone switches hands between shots.
Continuity mistake: When Mr. Plotz's secretary sneezes and sends her desk flying across the office floor, the telephone on top gets knocked from its hook and dangles over the edge. After she uses the intercom to call in sick we can see the phone hung up just like before, but her hands never touched it at any point.
The Three Muska-Warners - S1-E170
Continuity mistake: When the King of France is frightened by the Viper's arrival at 11:30, the digits on the grandfather clock's face change over to Roman numerals upon closeup.
Continuity mistake: When the Warners are at Pablo Picasso's home applying for modelling jobs, the front door hinges switch sides on the frame - immediately after Dot plants a few kisses on Picasso's cheek.
Continuity mistake: While watching Mr. Dan Anchorman on a control room monitor, Dot's hands jump to a different location as soon as the shot changes. At first she has both hands resting on the control board, then her chin.
Continuity mistake: When Flaxseed looks into a mirror and fixes his hair, he spots the Warners pushing their noses up to the candy store window. The Warners' reflections in the mirror are not reversed as they should be.
Continuity mistake: During the scene where Wakko flushes Dr. Scratchansniff down the toilet, the bathroom doorknob changes sides.
Continuity mistake: When Flaxseed is being tackled by the football team, the candy store's aisles instantly change behind Yakko, Wakko and Dot as they wave their pom poms.
Chairman of the Bored - S1-E139
Continuity mistake: At the Celebrity Gala, Marlon Brando and Tom Selleck are seated together at a booth. When Brando is about to eat a cantaloupe, the salmon overturns between shots.