When Season 22 was sold abroad, the episodes were separated into 25-minute segments causing some rather cheesy cliffhangers. From what I've heard they are:

Attack of the Cybermen:

Part One: The Doctor and Peri are followed in the sewers by a Cyberman
Part Three: Flast's revelation that the Cybermen intend to prevent Mondas' destruction

Vengeance on Varos:

Part One: the TARDIS landing on Varos
Part Three: The Doctor and Jondar rescuing Peri and Areta from their near animal changes

The Mark of the Rani:

I don't know about these but I've heard that one is where the Master grunts at the Rani (or the other way round)

The Two Doctors:

Part One: When the computer voice says "It threatened the Time Lords"
Part Three: Anita offers to show the Doctor to the hacienda
Part Five: The Doctor splashes his face with water, feeling the effects of becoming an Androgum

Timelash:

Part One: The Doctor and Peri leaving the TARDIS

Revelation of the Daleks:

Part One: Natasha and Grigory hiding in the catacombs as Takis and Lilt wheel dead bodies past
Part Three: In some versions, the Doctor tells Peri she is in great danger and in others, Davros orders the Daleks to kill the DJ

Quite exciting really? Does anyone know the other episodes I've not listed?