Factual error: At the start of the film the father (Cedric Hardwicke) alights from a LNER suburban train then walks to his Wimbledon home. The film is set in 1913 but the LNER was not formed until 1923. That apart, LNER suburban services did not serve Wimbledon. A few scenes later the father and mother are sending off their son at Liverpool Street Station on his journey to Osborne Royal Naval College at Dartmouth. Strange since Dartmouth would have been (and still is) reached from Waterloo.
Continuity mistake: While fishing, Mr. Peabody hooks a mermaid who is swimming underwater. When he reels her in and she leans over the edge of the boat, her hair is completely dry and perfectly coiffed.
Continuity mistake: When we see Daffy Duck hiding behind the tree at the start of the cartoon, you can see that behind him on the left there is nothing in the background, but when we see wiping the sweat off his face with a towel in the next shot, trees have suddenly appeared.
Continuity mistake: When the orange kitten slams Sylvester's right foot in the door, you can see that Sylvester's other foot is facing left, but in the next shot is now facing straight. There is also nothing on Sylvester's feet. When we see a close-up of his feet in the next shot, nails have appeared, and in the next shot the nails have vanished.
Continuity mistake: When we first see the baby bird in its nest at the beginning of the cartoon, you can see that the nest is positioned on a branch, but when we see the bird attempting to fly later on, the nest is now in the crook of two branches.
Continuity mistake: When Tweety hits Sylvester on the paw with a mallet, the background behind Sylvester changes between shots.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.
Continuity mistake: When we see Bugs dressed as Captain Bligh, there is a wooden sword on the mast behind him that disappears and reappears between shots.
Continuity mistake: When we Dale waving to Donald when he has taken more of his pancakes, there are initially five standard pancakes plus a large red one. When Dale is going into the hole in the loft in the next shot, there are now six pancakes.
Continuity mistake: When Porky thanks Sylvester for saving him, Porky is wearing a nightcap on his head. When the mouse in the cuckoo clock knocks Sylvester unconscious with a mallet, we cut to Porky and the nightcap has disappeared.
Continuity mistake: When the ant walks to the end of the cream pie and falls through some cream, you can see there is nothing around the pie. But a little later on, the pie is now surrounded by items from Donald's picnic.
Continuity mistake: When Bugs puts the lipstick on the plunger, he is holding a lipstick holder in his right hand. In the next shot, the holder has disappeared.
Continuity mistake: As he eats, a bread chunk rests on the table to the right of Oliver's bowl. As he rises, the bread is gone. (00:14:20 - 00:14:50)
Continuity mistake: When Yosemite Sam enters the saloon, there are swinging doors behind him. When he orders "all of you skunks" to "clear outta here", the other cowboys leave but the doors to the saloon have disappeared.