What are the side effects of having unwanted knots in a solenoid / enameled wire loop?
The radius of curvature on the knots is very tight so it's possible the insulation is damaged. The insulation has to be damaged in two places for there to be a short so you're probably okay, but it's not ideal.
Do not pull wire off the edge of the spool, unwind the spool, or you'll get a lot of kinks.