Watched this for the first time recently, a little bit confusing and they skipped any science which didn't help. Average!
Cause the science was really relelvent to the plot...
If any "science" was explained the film would be criticised for holding your hand! It didn't need to explained and if the film stopped to talk about the details of time travel it would have felt out of place
As for the person who said that the introduction of telekenisis was unecessary I can help but feel they didn't watch the film at all.