Jk Rowling was asked was anyone else in Godric's Hollow that night. She didnt answer meaning there must be some interesting information behind that question.
I always assumed it might have been just Voldemort and Wormtail there. But now I come to think about it I think there werent just those five wizards there that night.
I was thinking the other night why did the Lestranges and Crouch go to the Longbottom's after Voldemort fled, for information on where Voldemort had gone. I mean the obvious answer could be that as a high ranking ministry auror, Frank might have some confidential information and it would have been obvious they are in the order having fought Voldemort three times like the Potters.
Then I got to think maybe the question of who else was in Godric's hollow is intertwined with the question of why ask the Longbottoms.
I believe the Longbottoms were hiding in Godrics Hollow as well at the time of Voldemort's attack. They would have watched over the Potters while the Potter's did the same though obviously not in the same house lol
They might have alerted Dumbledore and the ministry, thats how he knew so much in 24 hours of the attack and to alert people such as Hagrid and Hagrid telling McGonagall.