Fabien Brandy was the toast of the town after securing Walsall a 2-1 win over Flynn's title-chasing team. The former Manchester United man capped an excellent second-half performance when cutting past defender Tommy Spurr in the 82nd minute to beat keeper Gary Woods and sentence Rovers to back-to-back defeats,
"I thought the defeat at Bury was a one-off and we kept things pretty low key at the training ground," said Flynn. "But unfortunately it wasn't a one-off and I spotted some danger signals that need to be dealt with and will be.
"We have to galvanise ourselves ahead of Tuesday's home game against MK Dons and we have got to get back to doing what we have been doing from most of the season, which are the right things. It was a good link up between Chris Brown and Billy Paynter for our goal and Billy finished it off well.
"We started to come back into the game around that time and we had our best spell of the game between then and half-time. Credit to Walsall, they came with a game plan and they caught us out."
Walsall boss Dean Smith was delighted to see his side avenge an opening day 3-0 defeat at home to Rovers.
"We knew it would be a tough game because they are a good side," said Smith. "We knew they were dangerous at set pieces and we worked on that in training and I thought we handled them well.
"Even though the pitch wasn't the greatest we got off to a great start and we played some good football in the first 15 minutes or so but then their physicality took over for the rest of the half. But I told the players at half-time that they are good footballers and to believe in themselves in the second half and we went on to win the game with a great finish."
Adam Chambers caught Smith's eye as did Doncaster-born midfielder James Baxendale, released by Rovers last season.
"James worked his socks off but, I brought him off because I thought Craig Westcarr would give us a bit more spark and the others fed off him," said Smith. "We have now won eight of our last 11 games and the players are playing really well."