When Kronos is flying around the Master's laboratory, the wires holding the actor up can briefly be seen.
The Doctor uses several household objects, such as a bottle, cutlery, keys, the corks from wine bottles, and an empty cup with tea leaves in it to create a device that interferes with the Master's TOMTIT time machine. This is utterly preposterous, even by Doctor Who standards.
The Doctor tells the Brigadier that The Master is using the crystal to bring historical figures back in time, when he should have said forward in time.