Continuity mistake: After the duck hunters scene Beverly is inside the truck with her left arm raised. In the immediate next shot it's lowered.
Continuity mistake: When Howard and Phil's microlight is about to crash against the stall the people run away. A shot later two men have suddenly appear only to disappear a shot later.
Continuity mistake: At the nuclear plant, when the visitors walk around the place Overlord rests his hands on a glass but a shot later they're lowered.
Continuity mistake: The Overlord sticks out his tongue and plugs it into the lighter. In the shot outside the truck the tongue disappears.
Revealing mistake: When the Overlord is driving the truck and a monster tongue comes out of his mouth he is replaced for a very cheap and blatant wax figure with fake skin and fluffy hair.
Revealing mistake: When the Overlord sends Howard flying and makes him turn around on air the shadow of the pole moving him is visible.
Continuity mistake: When Jenning destroys the Ketchup bottle he only breaks the upper part while the label remains perfect. A shot later the label in the lower part is broken in two.
Revealing mistake: When Jenning/Overlord sends a man flying through the window, the cable attached to his back is perfectly visible.
Continuity mistake: At the diner the position of the jean jacket changes in every single shot: sometimes it's between Beverly and Howard and others it lies behind her back.
Continuity mistake: At the bar, while standing on the counter, Howard punches a guy with a hat on. Then he punches him again and the hat is gone, only to reappear in the close-up.
Continuity mistake: Before Beverly, Doc and Howard take a seat at the diner the waiter behind the counter next to a couple is suddenly at the far side of the counter.
Continuity mistake: When Beverly, Jenning and Howard arrive at the diner a waiter is serving and later spilling a jug of water. A shot later he is magically gone and he arrives and serves water again, though this time he doesn't spill it.
Revealing mistake: Before the car pulls up by the diner, after smashing a billboard, skidmarks from previous takes are visible on the ground.
Continuity mistake: When Dr. Jenning is driving and says that the monster has taken hold of him he puts his left hand over his right hand, a shot later they swap positions.
Visible crew/equipment: Lighting screens are reflected on Phil's lenses when he removes Howard's feathers off his tail and leaves the place.
Continuity mistake: Right before the bad guys place Howard on the counter his drink disappears from the counter and reappears 30 cm away to allow for the stunt.
Visible crew/equipment: When the woman at the bureau of employment looks at Howard, the reflection on her lenses show a white screen used for lighting. Howard has disappeared.
Continuity mistake: Outside of the museum a bunch of kids reach out and touch Howard. The hands appear and disappear randomly between shots.
Continuity mistake: Outside of the museum Beverly and Howard argue next to a fountain. There's a shot of a man eating a sandwich in disbelief with a couple walking behind him. Shot cuts back to Howard for several seconds, and when it goes back to the sandwich man a couple continues their walk, they shouldn't be there.
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.
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.