Continuity mistake: At the start of Bev's final sing-a-long before the credits, she steps to the front of the stage with her guitar in hand. In the very next shot, when she starts to sing, a microphone magically appears in front of her. (01:42:49)
Continuity mistake: When Howard and Phil are being chased by cop cars in the ultralight, after Phil says "Trust your birdness - fly!", we see a front-facing shot that shows a cop car pulling up to the right of the ultralight. In the very next shot, no cop cars are even near them, just following. (01:19:55)
Continuity mistake: When the Overlord is about to explode the Ketchup and mustard bottles, the Ketchup cap is either loose or tight depending on the angle.
Continuity mistake: When Phil explains the ascent of duck, check Beverly's left hand: in some shots it is long enough to touch Howard's elbow, but in other shots her hand has shortened and it's by his shoulder.
Continuity mistake: In the angle shot from the side Phil holds the recorder with both hands, in the angle shot from the front he holds it with his right hand.
Continuity mistake: When Phil meets Howard he takes the recorder out of the pocket and takes it to his mouth. When the shot changes the recorder has vanished and he repeats the previous movements.
Continuity mistake: Howard falls through a ceiling and nosedives to the floor but a shot later he is falling butt first on the couch.
Continuity mistake: When Howard pulls up the microlight throttle the lab building is behind them. A shot later the building is gone and we see the gardens that the microlight passed by several minutes ago.
Continuity mistake: Before the microlight crashes against the banner the people gather on the road. A shot later the road is empty and people are gathering again.
Continuity mistake: Howard asks Beverly where he is and she extends her left arm to grab a bin behind. A shot later her arm is in front of her.
Continuity mistake: When Overlord electrocutes the cop there's an driver watching everything horrified. His right hand is either lowered or on his face depending on the shot.
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.
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.
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.
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.