Revealing mistake: At the party, when Lily is told by her dancing partner that she's dancing on air, the dark stunt wires keeping her aloft are visible. (00:16:25)
Revealing mistake: When the helmet is taken off Herman, it briefly pulls up the wig.
Other mistake: When YoYo drops Herman after the potion wears off, his wig flops up.
Audio problem: As everybody goes to get in the new car, you hear the horn honk twice. Trouble is, Grandpa wasn't holding the horn bulb.
Pike's Pique - S1-E5
Revealing mistake: As Herman goes to lift the couch, if you look at the fireplace mantel, you see the shadow of the mechanical hoist used to complete the gag.
Pike's Pique - S1-E5
Revealing mistake: After Grandpa says good night, there is a huge cloud of smoke, signifying his change to a bat. As the smoke clears, in the lower right corner of the screen, Grandpa can be seen ducking out of the shot.
Other mistake: Herman's Dr.'s appointment is at 9am but the wall clock in the Dr.'s office shows the time at 9:33 or so.
Suggested correction: Most doctors keep patients waiting much longer than this. The clock should have read 9:45 at least.
Revealing mistake: After Herman bursts through the door, he comes to the block wall. When he knocks down a section, it can be seen that is was specially set up. The edges on either side of the section are clean and neat rather than jagged as a broken wall would be.
Revealing mistake: Twice in the episode, Herman bursts through the front door. Just before he does, the pre-cut outline can be seen where he is to come through.
Visible crew/equipment: In the first scene of the episode, a crew member is visible through an open door beside the staircase.
Visible crew/equipment: As Herman goes to stand up from trying to wake Ramon, the top of the set wall is visible, as well as the cut away section of the ceiling.
Come Back, Little Googie - S1-E25
Other mistake: When Eddie's naughty little friend goes to shake hands with Herman they insert a quick close up of a hand buzzer in his hand, only it's obviously an adult's wrinkly hand.
Visible crew/equipment: As Herman comes over to talk to Dennison, you can see a cord trailing from camera right to his right leg, and a connection hanging out of his pants leg. Possibly for a microphone, or a power cord for the cooling unit in his suit.
Continuity mistake: As Herman gestures to Eddie to make his point, he drops his left hand. A second later, he does it again.
Continuity mistake: The doors to the room where Herman is in the sarcophagus case are matching when the man finds them locked, but a moment later the door the man breaks through is darker colored.
Continuity mistake: After Herman breaks through the doors in the opening sequence, the underlying wood over the right side of the hole is plain plywood. When it's Lily's turn to come out, the wood has been stained to match the rest of the door, and Herman's outline is more distinct.
Revealing mistake: When the show introduction focuses on the front door, the Frankenstein sized and shaped cut out area can be seen where Herman is to make his appearance.
Herman's Child Psychology - S2-E1
Continuity mistake: At the end, as the family sits at the table, Herman's napkin alternates between being flat and half folded.
Herman, the Master Spy - S2-E2
Continuity mistake: The trawler is visible after Herman goes out, then gone when Lilly scans for Herman.
Herman, the Master Spy - S2-E2
Other mistake: The Russian trawler shown appears a lot closer than three miles out. At that distance from the beach it would be very small in size, if visible at all, and then only if an observer had binoculars or telescope.
