When Simone rushes to her friend's house to 'help' her finding Tommy's journal, she parks her car inside some bushes on the drive way, preventing her from getting out of the car on the driver's side. Next shot she's in the other seat (on the right side of the car), taking that door to get out. It took her 0.001 second to move to the other side of the car.
In the 80's scenes, Tommy's mom pulls out a very modern Stanley screwdriver to break into his room.