Marouane Chamakh was played through on goal and the on-rushing Ben Foster slid in to tackle the Morocco international, with Foy deeming the England goalkeeper had committed a foul before pointing to the spot.
He decided against showing a card to Foster, who was then sent the wrong way by Chamakh.
Pulis, who saw his side move to 13th in the table with the win, said: "Looking back it looks as though the referee has got it right.
"Ben has caught him with his foot I think, Marouane touches it away and then Ben comes through and I think it is his momentum that catches Chamakh."
Pulis handed debuts to Ledley, Ince and Scott Dann and was pleased with their contributions - challenging them to add greater depth to his squad.
"I think the biggest thing about Tom if you look at what he did today was actually his work and the way he did all the unglamorous stuff that all good players do," Pulis added.
"We are pleased for him, Dann and Ledley, the big thing for the team is that the players who have been at the football club have done exceptionally well.
"Tom took his goal with aplomb. We have been moaning a little bit that we haven't scored enough from set-plays and Joe's header was first-class.
"The players we brought in they have to work as hard and have that little bit more quality but I'm pleased for the group, it is the group who have taken us where we are at the moment and it will be the group that decides whether we are good enough to stay in the Premier League or not."
- Sports & Recreation
- Joe Ledley
- Marouane Chamakh
- Tom Ince
- Scott Sinclair
- Julian Speroni
- Thievy Bifouma