A fifth series was planned but never came to light. The IT Crowd: The Internet Is Coming (2013) was made instead.
Hello, IT. Have you tried turning it off and on again?
During the animated intro, while Moss is smashing the keyboard with a cricket bat, his wrist watch is on his right arm. When they fall down the ventilation shaft, the watch is on his left hand. After the fall, he raises his arms and his watch is gone.