Just watched the game again. Barca had another penalty not given for Meunier on Neymar (he doesn't even follow the ball, goes straight to stop Neymar), and another possible penalty for Verratti on Messi, here he clearly pulled his shirt.
So, lay off with the 'help' that Barcelona gets. First penalty on Neymar is very clear, 2nd penalty on Suarez is soft, but I've seen those given even in the CL final between Milan and Liverpool (Gatusso on Gerrard). Nobody made that much noise back then.
The only clear decision against PSG was Mascherano's penalty on Di Maria. There were some decisions against Barca, and some plays were close and those were called for Barcelona indeed. That is what happened.