It's often easy to spot when there is a recruiter/manager disconnect. When the language is overly gregarious/buddy-buddy, or uses the stereotypical bad job offer language ("rockstar ninja programmer", "we have ping-pong tables and free snacks!", etc...), you know the requirements can be taken with a grain of salt.

Definitely brush up on the things listed, though. Walking into an interview without at least a cursory recognition of what a listed language/framework does sucks, as it wastes your time and the interviewers'.

Also, be wary of bad recruiters. If they drink their own kool-aid and actually enforce the arbitrary x # of years in foo language blurb, you might be screwed (as well as the manager that put out the request for a hire in the first place).