Arrival, when No.6 is attempting to escape by helicopter, the rotor blades are not turning!
A B & C, when No,.6 kicks in the grill when he is breaking into the secret laboratory, his socks change colour!
Free For All, No.6 attempts to escape the village by boat at high tide, he is also over powered by the village Guardian at high tide. But when the ambulance collects No.6 it is at low tide!
Checkmate, in the opening few moments of the episode there is the lush green lawn minus a chessboard, yet moments later the white squares of a chessboard have been laid out!