Remus hated changes in plans. If something was planned meticulously beforehand and then altered at the last moment, no matter if the alteration was just minute, it still got him annoyed.
Therefore, the Marauders had to take care of discussing the whole plan of their pranks carefully and cautiously so that no last minute changes would occur.

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101 THINGS ABOUT REMUS LUPIN
FanfictionThe title pretty much says it all. This book contains about a hundred facts on Remus John Lupin's life, personality and character. We all have a fair idea on who he was, what he did and how he died but don't we all want to know a lot more about him...