Horns of Nimon Redux: A Couple of Things

This is the saddest thing in the world: a post pointing out plot inconsistencies in an episode of Doctor Who. Anyone with a life or aspirations of getting one should look away now.

Anyone however who saw Planet of the Dead on Saturday may have found any or all of the below mildly annoying:

• Why didn't the bus driver stop when he saw the police were chasing him?
• Why couldn't the cops overtake a red bus?
• Why is a jewel thief toting around a shovel?
• Why is the turn-off button for the security grid outside the grid?
  
• Why does going round and round in circles make a hole in space-time?
• What control is he using to make the bus go up and down?
  
• So let me get this straight, they put this cup that's so valuable an armed guard stands around it with a laser grid all the time but they put it under a skylight and don't have a lid? A basic glass display case would've stopped her, is all I'm saying.

Any other quibbles, you sad bastard, leave them below. Just to pre-empt some quibbles, overall I liked the episode, despite my new fondness for the alternative title Horns of Nimon Redux. That's more about the basic plot than the infamy of the serial in question...