Donna is wearng diffrent clothes to when the TARDIS starts shaking at the end of The Poison Sky.
''to be added''
If the hath are part fish/part human why cant the one in quicksand:
Swim
breath (he has a breathing apparatus!)
If the tardis hand detects another timelord and takes you straight to them why doesnt it take the doctor and donna back to Jenny at the end of the episode?