I just rewatched 'Doomsday' and was struck by a glaring example of something quite common in action/cop shows/movies. When there is a car chase the pursuers and the pursued always travel at the same speed.
The heroine of 'Doomsday' is in a Bentley Continental GT (top speed 201.9 mph) and is being pursued by the cannibal gangs in a motley collection of vehicles including a plumber's van and some really old, crap, cars. The roads are empty and fairly straight. Really she'd just vanish into the distance and there would be absolutely sod all they could do about it. In the film they gain on her and there is all the usual action with cannibals jumping onto her car and trying to climb in through the windows and so on.
Exciting, yes, but stupid. Why not just have it that the car she finds, and uses in her getaway, isn't a supercar but is something slower - a Landrover Discovery, perhaps? What a waste of 0-60 in 4.3 seconds!
It's still a good film, and Rhona Mitra was excellent in it (so much so that I used her names for those of the gorgeous Jaffa harem girls in 'Olaf through the Stargate' as a tribute to her - she so should have played Lara Croft instead of the irredeemably American Angelina Jolie) but that doesn't mean little things like the car chase fail don't annoy me.