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.
What an Idiot: Van Helsing, Jonathan and Dr. Seward during the final confrontation; they already know they are dealing with a vampire, yet they don't bother to properly prepare themselves when confronting the count (like bringing stakes and garlic along) but instead try to fight him with their bare hands and whatever objects they find in his lair.
Justified, however. They were short on time, as they only had that night to find and kill Dracula. Had they taken the time to prepare properly, Mina would have been turned by Dracula.
...except that they had time to throw an elaberate party with a giant mirror to identify the vampire. They should have had the stuff together before he even ran.