Does the word things need a apostrophe?

If it is used as a plural, then no. If you were referring an object as a thing, and were talking about something that belonged to it, like "The thing's head" then the apostrophe is used. For plurals, you don't use apostrophes, but for possessive situations, you do. So you could say "There are lots of those things there" and you could say "Look at that thing's side."