The Potters reached the 40-point mark with a win over Wolves, and the 54-year-old feels this may have played a factor in his side's lacklustre performance on Monday
The Potters surpassed 40 points - the benchmark for Premier League survival - with victory over Wolves on Saturday.
And the Welshman believes this may have contributed to the lack of intensity in his side's performance at times.
He told reporters: “I was pleased today, I thought it was going to be very difficult for us because Villa are fighting for their lives and it is always a difficult place to come.
“With us getting to 41 points on Saturday against Wolves I think there was that bit of [complacency] there, us thinking we can put our sandals on and think about flying out of England but they were brilliant.”
Pulis expressed his belief that his side showed resolve to earn a point after a long season and also claimed that Villa's opener came against the run of play.
“That’s 51 games now we’ve played and our second one in three days," he said.
“I just feel we lack a lot of things, though one thing you cannot fault us for is our effort.
"We were disappointed to be losing the game, I thought it was a great goal from Weimann, but that was their first effort on target."
The 54-year-old reserved special praise for Robert Huth after he levelled for the visitors with his second goal in as many games.
He added: “I think if you speak to Robert he will tell you he is disappointed he hasn’t scored more this year.
“They [him and Ryan Shawcross] attack the ball very well and we get good quality in and good movement and that is very difficult for other teams to defend.”