Continuity mistake: After Howard and Beverly exit the museum, a couple on the left run away. And the following shot they are nowhere to be seen, at least they should get reflected on the glass.
Continuity mistake: After Phil shows the ascent of man drawing he walks behind Beverly but in the close-up he disappears. A shot later he is now standing on the opposite side of where he was.
Continuity mistake: When Beverly says goodbye to Howard the handle of her umbrella is either facing upwards or downwards depending on the shot.
Continuity mistake: During the fight against the punk before one of them says "You're breaking my fingers" Beverly's position behind changes between shots.
Revealing mistake: After Howard in the flying chair passes by the elevator and zooms through the hallway he becomes violet due to the blue screen effect.
Revealing mistake: When Howard's chair is launched backwards, right before he crashes through the toilet room check for the black metal object underneath the chair where the mechanism to move the chair is.
Revealing mistake: Before Howard's chair is launched backwards everything appears to be shaking but check the coat hanger behind and the stuff on the floor and they remain still revealing the camera trick.
Continuity mistake: When Howard is reading the magazine the ashtray moves from being on the edge of the table to some inches away between shots.
Continuity mistake: During the credits Howard throws some letters and postcards on a chair. Their position changes between shots.
Continuity mistake: When the cops chase the microlight, the grey raft leaning against a stall changes positions between shots.
Revealing mistake: When Overlord moves the chairs and tables to block the door, the strings used to move them are visible.
Continuity mistake: When Howard is about to fight in the bar he walks down the counter and passes by the same people twice.
Continuity mistake: In the diner, the glass of water next to Howard appears/disappears and changes positions between shots.
Revealing mistake: When Howard enters Earth and falls through a ceiling the safety cable attached to him is briefly seen.
Deliberate mistake: When Howard is being sucked out of his planet by the laser beam the couch ignites but he doesn't.
Visible crew/equipment: Before Overlord shatters the glass at the nuclear plant, the cameraman on his right is reflected.
Visible crew/equipment: When the movie ends and Howard and Beverly dance onstage a mirror reflects the crew and cameras.
Continuity mistake: When Howard stares at the TV playing the news the couple to his left disappears between shots.
Continuity mistake: Howard arrives home and throws his coat on a chair. The way it lies changes between shots.
Revealing mistake: When Howard's couch starts to shake the ashtray and table on his left don't move an inch.
Answer: As she said to Howard, she believed that he was using his "outlandish" appearance to be unable to find work and collect money through unemployment. She's probably dealt with people who did the same thing and was eventually sick of it.