Hypergenesis and come into play effects

[Atwa]

I was wondering, if my opponent plays a Hypergenesis, do any come into play effects resolve after all players have finished playing cards of Hypergenesis?

I'm curious, since I cast a Wall of Blossoms as my first creature and it would be nice if I could draw another creature this way to put into play of Hypergenesis.

We ruled I couldn't at the time, guessing you can't interupt the resolving of a spell by any effects, but I want to know for sure.

Also, if it isn't possible (which I think is the case), how do we decide in which order the various come into play effects will be put on the stack?

[VsTheWorld]

Correct, the triggered ability of Wall of Blossoms does not go on the stack until Hypergenesis has finished resolving. As far as determining the order of comes-into-play effects, you determine it the same way you would deal any other triggers: APNAP order. The active player chooses the order in which his triggers go on the stack, then the non-active player chooses the order for his, which go on the stack above those of the active player.