there are bad movies. slipstream happens to be a real bad one. the idea itself is cool. but that's it. really. bad script. bat acting. stupid characters. plot holes.
come on, the bank-robbers in the bus start to sing? i just don't believe this is real. i feel i've just lost another 80 minutes precious time.
the explanation, which characters can travel back in time, and what will remain the same (clothes, money, but not the bullets) is a joke. probably the best part is, when the time-travel-ipod-like-gadget gets hooked on via USB to a laptop, because it's screen broke. you can probably think, that this movie is a spoof of its own. avoid this one.
go and watch "the butterfly effect".