Suspension of Disbelief is at times hard to Suspend

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I love science fiction and well any fiction for that matter. I am willing to overlook many things in a science fiction story if it is compelling and well acted with good special effects. However, (and you just knew that however was coming!), there are times I cannot buy what the writers and directors are selling me. For example, there was this episode of Star Trek:TNG called "The Next Phase" where two characters were present on the ship in another phase of matter. They could pass through solid material including humans, consoles, and even walls. There was a "bad guy" in the same phase and a great chase with a fight ended with the bad guy being thrown through the hull of the ship into outer space. I kept asking myself the entire time, "Why don't they fall through the floor!?" Overall, I like the episode and how Ro and LaForge deal with death, but I always remember that particular element about the floor.
Another example of something I really cannot buy is when a character ages due to an illness or diabolical potion or some DNA mutation. The character gets long grey hair, wrinkled skin, age spots, maybe even a hump. Then someone has a magical cure and the aging is reversed. Poof! No more wrinkles, age spots, grey hair! I want that cure please!
Just as bad is when a character mutates into another creature with webbed hands or bug eyes and blue skin, actual cranial and other bone changes. I understand stopping the process but reversing it! The hands go back to normal, the skin is pink, and the bones the way they were, WOW!
Oh well, it is all in good fun!