Faris is awesome in this!
Not a huge fan of her work, to be honest, as usually it's straight up scary movie type humour, but she did a great job in this! Really pleased they got her, and she should make more films like this (or Lost In Translation). The bob on Cassie (3) was hot ^_^.
I'm a huge time travel buff, and this film feels like it was made for me ^^ all those sci-fi (science fiction) references! The Time Travel mechanics in the film are a little screwie, but that's okay, it's funny ^^
The funniest paradox is Cassie telling Ray that he is integral in the creation of Time Travel before he creates it, going so far as to explain that it is an internal system. Obviously, based on that information and the time leak/parallel universes he then encounters - he writes the book which then allows for the creation of Time Travel.
*universe implodes*