When Scorch arrives at the 7-Eleven, the flying camera remote is nowhere around, even though it's still broadcasting video footage from right behind him.
Halley's Comet is shown with a long tail. Comets only have tails when they are close to the sun, not "50 years away" as told by General Shanker.
According to the Halley family, their name is actually pronounced Hall-Lee not Hail-Lee. Some characters in the film get this wrong.