I was a little confused as to when the magna-grab remote became the resit button or why, even after being burned, why I would want to attack anyone.
Initially I thought the magna-grab remote was
the magna-grab, so I was confused. Once I realized it was the remote (yes, I know the Doctor says this to the Van Baalen brothers while holding the remote, but then he mentions something about the remote being in someone's pocket, so I got confused) it all made sense.
The magna-grab (a device presumably mounted on the salvage ship) is used to cripple ships. It is activated by tapping the top of the magna-grab remote, and deactivated by tapping the top again.
It was the magna-grab device that catastrophically crippled the TARDIS in the first place (because its shield oscillators were down, otherwise it would have no effect), causing the engine to explode, the time rip to happen, the fuel to leak out, and all the other problems in the episode.
By tapping on the magna-grab remote in the end, the Doctor deactivated the magna-grab device, preventing the TARDIS damage from occurring, and causing the reset.
I was fairly forgiving about the scary zombies---after all, there needs to be something to scare the children into running behind the couch.
It always confuses me, though, that the camera crew unfocuses the camera whenever filming the creatures (whether the zombies this week or the monsters from Hide). I can understand using a fuzzy lens to film a "creature's-eye view" but why would someone's vision go fuzzy when looking at the creatures?