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: In the scene where Ward is waiting for the boys outside the movie theater, several kids are seen walking out of the theater more than once. A brunette girl in a plaid dress is seen walking out at least six times. (00:02:00)
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: 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)
Continuity mistake: When June enters the boys' bedroom at nearly 1:00 am, she turns on their light. In the closeup, she flips the light switch, which is already in the up position, and the light turns on, but in the next shot, the light switch is in the down position. Then, when June exits their bedroom, in the wide shot, the light switch is in the down position, but in the closeup, the switch is in the up position so she can flip it down (off). (00:06:35)
Visible crew/equipment: After Bengie pours the green paint all over himself, when his mother arrives, there's a chalk T-mark on the floor by the door. (00:19:45)
Visible crew/equipment: In the middle of the night, when June walks in on the boys reading Tom Sawyer by flashlight under the blanket, the shadow of the moving boom mic is visible on the wall, at the right side of the screen. (00:06:40)
Continuity mistake: While Wally, Beaver, and Eddie are talking about military school, Beaver is sitting inside a car tire swing, and depending on the shot, the tire's whitewall stripe either faces away from Beaver's front or his back. (00:17:25)
Visible crew/equipment: After Beaver and Larry decide to head over to the supermarket for free food samples, when it cuts to Wally's bedroom, there's a T-mark on the floor beside his bed. (00:09:55)
Visible crew/equipment: When Wally enters the kitchen and tells June that Beaver is upstairs changing his backwards underwear, the T-mark is visible on the floor under the sink. (00:01:05)
Continuity mistake: While Beaver and Larry are watching the "corkscrew" digging a hole, when their books and lunchboxes are run over by a truck, the damage changes in the following shots. (00:04:40)
Visible crew/equipment: While Ward and Beaver are in the garage, Ward straightens out Beaver's Olympics three-legged race misconception. Then, just as June enters the garage, the moving boom mic casts a shadow at the top left corner of the screen. (00:07:40)
Visible crew/equipment: When Tooey and Eddie come over to see Wally's "really sharp" new plaid suit, the boys go upstairs to see Wally's new crazy socks. Then, just as Ward tells June the suit looks like a horse blanket, the shadow of the moving boom mic is visible at the top right corner of the screen. (00:15:20)
New Doctor - S1-E32
Visible crew/equipment: While waiting for the new young doctor to arrive, June gives Beaver the glass of orange juice and heads downstairs. When June walks back into the kitchen just as Wally and Eddie enter the back door, there are multiple curved chalk marks visible on the floor. (00:14:25)
Captain Jack - S1-E3
Continuity mistake: Ward jokes about the boys having two baths in three days, being some kind of record. It then cuts to the boys sitting on the floor in the bathroom, and we can see the hamper at the right with nothing atop it, but when Wally stands up to put CJ back in the "aquarium" the tank lid is lying on the hamper. (00:11:35)
Continuity mistake: June makes Ward go to school to talk to Mrs. Rayburn. She says Mrs. Rayburn was her teacher and still makes her nervous. In Beaver gets 'Spelled episode, June doesn't recognize the name of Mrs. Rayburn on the flowers. Ward says that the only Mrs. Rayburn he can think of is the principal at school.
Continuity mistake: In season 1 (1957), Beaver is in grade 2 and Wally is 13 and in grade 8. Tony Dow was born in April 1945 and Jerry Mathers in June 1948. This means that Beaver/Jerry would have been 9 and Wally/Tony Dow 12, with a 3-year age gap. In the last (6th) season, Wally is a senior which indicates that he must have failed a grade. Meanwhile, Beaver is in 8th grade. Interestingly, the actors were also 3 years apart in age. At age 12 in 1957, Wally should have been in 6th/7th grade, which is more consistent with him being a senior in season 6.
School Play - S2-E11
Visible crew/equipment: At the start, while Whitey is reading aloud about the school festival, there's a large chalk T-mark on the floor in front of the boy at the center, and a small T-mark on the floor between Whitey and Beaver. (00:00:45)
Visible crew/equipment: After Ward has a word with the boys about having consideration for another person's happiness, when Wally and Beaver enter the kitchen, we can see chalk marks and T-marks on the floor near the counters. (00:22:10)
Visible crew/equipment: When Ward joins June in the kitchen he asks what's up with Wally, and his actor's mark is visible on the floor, then as June walks away, her T-mark becomes visible on the floor as well. (00:06:00)
