Rundown of his claims against her here: https://www.dailymail.co.uk/tvshowbiz/article-14295303/shock-new-claims-Justin-Baldoni-Blake-Lively-lawsuit-Taylor-Swift.html
The funniest one is that she rewrote a scene and used Ryan Reynolds and Taylor Swift to intimidate him into approving her changes. She referred to herself as Khaleesi and RR and TS as her "dragons."
I'm amused by the shitty legal advice and/or lack of client control. She's an A-lister (courtesy of her husband and friends), and no one has heard of this dude until this shit show of a movie. All she had to do was lay low for six months and then 99% of people would move on to something else and forget about this mess. But oh no... She had to take it to a whole other level, sue the guy, give the story more life than it deserves, and now Justin is famous. WTF? And you bought yourself and husband a counter suit that includes claims consistent with rumors (that haven't seemed to hurt you -- yet) about what assholes you are in real life. This is mutual assured destruction, and I'm entertained.
And I cannot imagine how excited their lawyers are to bill the fuck out these people. Bravo.