Most of my lucid dreams are ridiculously unrealistic; generally everything happens at insane speed (e.g. moving from one part of town to another, miles away, takes less than five seconds). Sound is almost always missing. Smell also, but visuals tend to be similar to physical reality. Generally, nobody talks - all conversation is telepathic (or whatever it should be called). Nearly all motion is by way of flying (mine that is - DC's tend to be gravity-bound).