These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adaptation Distillation: The film cleaned up quite a few inconsistencies in the book, tightened the storyline considerably, and gave Andre Marek and Lady Claire's romance some much-needed depth.
Idiot Plot: A really big one. The time machine can send travelers to any place and time on Earth. A professor traveled back to a specific time and place. So they send his students to retrieve him a few days after his arrival, instead of setting the destination time about a minute before the professor's arrival.
Also, they have to take into account the potential problem of a Grandfather Paradox: if the professor had been rescued by his students as soon as he arrived, he would have not written that note and would have not left the bifocal lenses, and thus the students would have not gone to rescue him. Thus, they have to wait until the professor writes the note.