Suspension of disbelief is necessary no matter what the TV show or movie but whether or not the audience is willing to go along with it hinges upon it being entertaining or amusing and the plot itself being engaging. From the very beginning we've had to suspend disbelief; it's unlikely that men and women of science would not be able to tell whether Homer was a human or an ape but it's humourously insulting that they can't. It's unlikely that Homer would survive falling down the gorge but it was a funny moment and a fine episode all around so I'd say for most fans, it doesn't matter.