User blog comment:Paul.rea/Teen Wolf News 101414/@comment-98.211.245.210-20141021044338/@comment-4091815-20141028001118

There are a number of breaks in filming that would allow any working actor to return to LA briefly to film a cameo or an entire episode.

They'll be filming for several months, including months when shows like Arrow, The Originals and Reign are not filming.

Conceivably, any working actor could do two shows at once as long as the part isn't too time-consuming.