Visible crew/equipment: In the scene where Mays Gilliam is walking in the rain after finding out he no longer has a job, it is so sunny, that you can actually see the rain-making machine in one of the shots. It looks like a windmill spraying water and its shadow is reflected on a roof of a building.
Deliberate mistake: Mays Gilliam and the girl is standing and are about to kiss someone suddenly shouts, "Freeze." They are now totally surrounded by cars and armed policemen. Wouldn't Gilliam and the girl notice them arriving before they were about to kiss and before the man shouted?
Continuity mistake: When Mays picks up Lisa in the campaign bus, they are seen driving down the road and you can see the front of Lisa's red shirt that she is wearing under her coat. The camera angle changes and her jacket is now buttoned up in the front and you can no longer see the front of her shirt.
Revealing mistake: Within the various shots of the Campaign Bus, there's one of the side of the bus with the sun shining perfectly on it, so you can see through the tinted windows. Rather than it having walls, TVs and the stuff it shows on the inside of the bus, you can easily see the bus is empty and you can also see the seats of the bus arranged in a normal manner.