Gluk Shmuck: If you look at Abe in AO he is blue and the Muds are green so it was easy to identify him. But in AE you'll notice he looks more like the other Muds. As for controlling the pants, AlphaScrab is right, the tail curls around a special nerve sensor that detects nerve pulses.
Kleeng: The pipe is a feeding tube like Oddling said. The pants have special internal pockets that holds a special seyrum, possibly a seyrum created by the Vykkers.
