im knitting a beanie and it has become twisted on the needles. Will this work itself out when im done or do i need to start over? 
Is the actual cast-on twisted? If it is you’ll need to frog and start over. If you need to you can knit a few rows flat and then join. The tail at the gap can sew that tiny edge up just fine.
If it’s only twisted while you’re working and the join is fine then the answer is yes, it will work out as it gets longer. That’s pretty common when there isn’t a lot of work on the needles.