From what Im getting and what im getting from others it seems that if eren actually ate his dad then he must have gotten his dads memories? Im not exactly sure but it is possible. So Erens dad is on the carriage then it must be his dads memory.
When eren left home as a child, that flashback he had of his dad giving him a shot was when it happened. After they moved inside the wall, his father came to find him and did all that. Proof is in the flashback he told his dad that he was acting crazy after mom died. So it was after the fall in his home town. The attack on reiss probably happened during the time the wall was breached or after he came home to find his home and family gone
Whoaa now i think reiss is the one who caused the wall destruction, and somehow it's connected to their religion (talk about mysterious 100 m wall made from titans, cruch people, etc) and so grisha wants revenge due to their action
there is something I don't get...when Maria wall fell, we could see Eren's father rushing back home, hoping that his wife Carla, Eren and Mikasa would be allright. So, when did he see Eren again? I don't get this :/