In the recap of Irv falling, a large piece of broken cup was seen in the wood floor. But when Irv hit the floor, the broken cup was gone.
Ephram admitted having a scar from the fact that he rebuffed his mother's goodbye hug on the day she died. Rewatching the pilot shows she only patted his back in support for his recital and he said 'see ya' so there was no such spurned hug. Faulty memory or faulty writing.
On the wall in the flashback of Dr Abbott's office is the small mantle clock given to Linda in season two.
It was not explained why Linda was absent at her stepfather's funeral.