The exercises were in the old game when you chose the pumped body option for Lisa to accept as his girlfriend. Max had to do some yoga sessions. The school had the old game, but it was only to visit Lisa and go to Olivia's house on Tuesdays and Fridays. There were also events with Vicky in the cafeteria, was the last content along with Diane, Olivia's mother. The Mall I saw some unofficial DLC's made by fans, I didn't really like it, I mean I didn't find it interesting to go to the mall to buy clothes for the girls and then do little nasty things with them (hj,bj,sex). In my opinion, this has no impact with the story and as this game is not open world, there is no need to have content from the mall I think. It's like doing the same thing repeatedly.
About Eric, I'm not sure if this character is being a part of the story or if he's just an figurant. I thought this version 0.7 would bring contents to define the character's future. This clothing system delayed its content a lot because there are 2 paths to be written, friendship and enemy. In my opinion, Eric is not a character that should go to the end of the story, because Max has to learn from him or deal with him. As soon as Max finds out Eric's intention or take advantage of it, he will have plans to kick it out. For those who like NTR, another villain could appear in the future, of course there are some who want to see Eric fuck Alice, Lisa or Kira, it would also be interesting to see Eric and Max do a threesome with someone. This has to be thought of quickly, to let Olivia's content opened because it will probably be more extensive and will still have Kate's content, I never liked Kate's content on old BB.