Speaking of plot holes, we have the whole time turner business in Harry Potter. One case of time travel being trivially used by a third year student to go back in time for hours at a time to take multiple classes. Who ever thought this was a good idea?
There was a Simpsons episode (one of the Treehouse of Horror ones) where Homer went back in time and kept trying to change things until eventually he ended up in a parallel universe where the characters had long forked tongues (and another where it rained donuts).
Not 'seen' exactly, but in The Dark Tower there is an element of Time Travel, first it's shown as a way forward but in Volume 5 the main cast are required to go back in order to purchase a plot of land to fulfil their quest. Then we have the case in Back To The Future where Biff gets the Sports Almanac and earns a fortune by predicting the correct match scores and makes trillions.
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