Megatron has electronic lights, sounds and speech.

In tank mode, Leader-1 can be attached to Megatron's turret to trigger firing sounds. He can also activate a flipping missile.
Megatron has Mini-Con prisons, grabber claws and traps, Mini-Con ramps and storage areas. He can hold more than 10 Mini-Cons.

In robot mode, Leader-1 can attach to Megatron's arm to reveal a sword in the larger robot's hand. Leader-1 can also activate a missile launcher, or become a weapon himself to be wielded by Megatron.

Jetfire has electronic countdown and launch sounds.

In shuttle mode, Comettor can attach to become Jetfire's landing gear. He can also activate Jetfire's missiles.
Jetfire has cargo bays for storing Mini-Cons, and can hold up to 10 Mini-Cons in total.

Jetfire can also combine with Optimus Prime to become Jet Prime.