I did notice one mistake where someone screwed up dates. At one point, Kyle says he was born in 1975.
The movie takes place in 2018. That puts Kyle at 43 years old in the film. Kyle gets sent back to 1984 from 2029. That means Kyle is 54 when he goes back to save Sarah.
Methinks Kyle was supposed to have said 1995. That makes him 23 in this film and 34 when he saves Sarah.