They sure can.
I hope the crew watch the video before each flight. Sometimes I forget how to put on my seatbelt, so i just leave it off.
There is a reason that flight attendants have such rigorous training in emergency situations, and spend most their training time on this (not how to offer coffee or tea).
There's also a reason flight crew take on frequent training. It's to ensure they are always up-to-date with emergency procedures and the like. It's drummed into them from day one.
The least I can do is pay attention to them. The last thing I want is to forget something in an emergency, even though I may take up to 100 flights a year. It's not like the in-flight magazine is going to take my entire flight to read anyway
I can't remember the term for it, but there is a condition where in an emergency you forget a lot of what you'd usually remember as part of 'routine' as you're so sure you know it, you don't bother to re-enforce it in your mind. There have been situations where people have 'forgotten' how to operate seat belts in accidents. I'm not an expert, but I have read it somewhere (if someone has a link to a specific example, please mention it).