Audio problem: When Bugs is performing his "Brahms Lullaby" outside Sam's bedroom, we hear him singing the music but his mouth isn't moving.
From Hare to Heir (1960)
1 audio problem - chronological order
Continuity mistake: When Sam takes the salt shaker to Bugs, he places it on the corner of the table, but when Sam walks back to his chair, the shaker has disappeared.