yes in some elevators are the triggers a bit messed up for example in 18 and 05, if you want to be really safe though just get to the back of every elevator, at the beginning, and you should be fine.

If you have more questions, in the Portal Speedrun Discord are many awesome people that are happy to help you.

e02 is the last map this is were you fight glados. you might miss another split and it stopped counting because of this