“Everyone’s nervous at their first rose ceremony, so we make it real easy for them, and we break [shooting] up into three to five people at a time,” Chris said in the interview.
“Then we’ll stop, just to make sure we don’t run into any mistakes. We don’t want a [microphone] in his ear, we don’t want cue cards, we want it as natural as possible,” the producer added.
Although the system might appear to be foolproof, it can’t eliminate every mistake.
As CheatSheet notes, Jesse Palmer did make a slip up during the shooting of Season 5. Convinced that he knew the name of the contestant he would like to continue dating, The Bachelor was shocked to find that the woman who stepped forward to accept the rose wasn’t the one he had in mind.
Source : https://www.distractify.com/p/how-does-the-bachelor-remember-all-the-names