Continuity mistake: When Margie Manners is shown mopping the Cleaver's kitchen floor she is using a sponge mop. When Wally comes in, the scene then shows Margie pushing a string mop against Wally's shoes.
Continuity mistake: When June is talking to Wally, she's wearing a wristwatch and her wedding ring on her left hand. But in a close-up shot of her hands while she's making a sandwich, her left hand is bare with no watch or ring. Back to the wide shot, and the watch and ring are on her hand again. (00:05:25)
Character mistake: The lady that talks with Miss Landers about the play calls Gilbert Bates "Gilbert Harrison."
Continuity mistake: When Beaver makes a face for The School Picture, he sticks his tongue out. But when Mrs. Rayburn and Miss Landers are looking at the picture sometime later, Beaver isn't sticking his tongue out. (00:13:00)
Continuity mistake: At the start Ward drives up in their old 1959 Plymouth Belvedere. He had been driving the 1961 Plymouth Fury for some time in season 4.
Deliberate mistake: Although it was done for plot purposes, no school photographer would only take just one shot of a class photo. They generally take up to 15 to 20, as it is difficult to get everyone to look at the camera and smile at once (and hopefully not pull silly faces).
Other mistake: The opening credits for season 5 show June coming out of the front door with a pitcher of what looks like iced tea, and calling for Ward, Wally and Beaver who are all working outside. But the door opens by itself as she comes out, and then closes by itself behind her. If the entire family is outside, who opened and closed the door?
Continuity mistake: After Eddie and Lumpy show up to help The Beav and Wally load the lawn trash into Lumpy's car, Eddie places a lampshade and a woman's hat over a burlap bag of trash and jokes it's Lumpy's date: "Who says Lumpy can't get a girl?" Just then the camera cuts over to Lumpy who says "ha ha ha." The street is at Lumpy's back and a car is driving in the background towards Eddie. When the camera switches back to Eddie, Lumpy approaches Eddie. The car should drive past, but it never does. (00:14:37 - 00:15:40)
Eddie, the Businessman - S6-E6
Visible crew/equipment: June and Ward are in the kitchen, Eddie leaves and Ward and June continue talking about Eddie and Wally getting hired at the dairy. The next scene shows the exterior of the house, and a dark figure is seen walking from the house toward the garage on the left side of the screen.
Visible crew/equipment: As Beaver, Gilbert and the golfers walk toward the camera and continue offscreen at the end of the episode, the shadow of a man wearing glasses falls on them (none of the actors were wearing glasses). (00:23:25)
Visible crew/equipment: When Beaver works as caddie the second time, the group are at the 18th hole. As Messrs Langley and Howard walk off-screen to the right, the camera crew's shadows can be seen on the actors' sweaters.
Continuity mistake: In "The Credit Card" four episodes before this one, Eddie uses the $15.00 that Wally pays him from a loan to buy a vest. Later Eddie has to give the vest to a friend in order to get back money owed to Eddie's father. But in this episode we see Eddie at Lumpy's party wearing the very same vest.
Revealing mistake: While Beaver checks to see if the paint's dry on the patio table, when the bee appears and flies around him, the wire is visible. (00:19:00)
Wally's Practical Joke - S6-E35
Visible crew/equipment: When Eddie Haskell comes over to scheme getting back at Lumpy, just as Eddie, Wally and Beaver are heading up the stairs, a mike boom is visible in the upper left corner.
