Continuity mistake: When Sylvester crashes into the bridge after catching hold of the speed boat, the position of Sylvester's head on the bridge changes between shots.
Continuity mistake: When Granny and Tweety are on the gondola, you can see that Tweety's cage is in the front. But when the gondola passes under a bridge, the cage is missing.
Continuity mistake: When Sylvester is heading for the water after Tweety burst his balloon, he puts on a green bathing cap. But when he lands on the sidewalk, the cap has gone.
Continuity mistake: When Sylvester is using his inflatable raft, you can see he has a paddle with him, but when Tweety bursts the raft, there is now no sign of the paddle.
Continuity mistake: When we first see Tweety's cage, you can see there is nothing inside it, but when we see Tweety playing his mandolin, a swing has suddenly appeared.
Continuity mistake: At the beginning of the cartoon, we see a view of Granny and Tweety's hotel balcony and you can see there is nothing in sight, but when Granny enters in the next shot, a table appears from nowhere.
Continuity mistake: When Sylvester sucks the spaghetti into his mouth after thinking he has captured Tweety, you can see bowl next to him is full of spaghetti, but when he is clobbered on the head by the mallet, the bowl is empty.