What do you think of the just discovered never before seen footage?

Amazing that they found this! Loved the alternate takes. And apparently there's a whole lot more.
What was Aykroyd doing in that one clip? Even Ivan doesn't know, ha. Any theories?

https://www.youtube.com/watch?v=SHNCMBdZ93k

Time stamps for the clips are in the description.

Can't wait to see how they utilize it in Ghostbusters 2020