Before I go any further, please understand this is for the sake of discussion, and I am not endorsing this as doctrine.
In studying yesterday, I came across a train of thought that stated the 120 probably were not in the upper room when the Holy Ghost fell.
Acts 1:13 "And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and judas the brother of James".
Acts 2:1 states:
"And when the day of Pentecost was fully come, they were all with one accord in one place."
No real mention of them still being in the upper room.
Luke 24:52-53
"And they worshipped him, and returned to Jerusalem with great joy:
and were continually in the temple, praising and blessing God. Amen.
The writer postulated that they were probably in the temple when the Holy Ghost fell, due to Luke's writing.
Whadda you think?