Rovers were beaten for the fourth time in six matches as goals from Lloyd Owusu and Calvin Andrew gave relegation-threatened Brighton a 2-1 victory at the Memorial Stadium. Rickie Lambert had put the Pirates ahead with his 28th goal of the season.
Trollope was again left to rue his side's sloppy defending, he said: "I have learned a lot about the players over the last few weeks when it comes to planning for next season.
"Not for the first time, they were poor goals to concede from our point of view. And not for the first time, we struggled to produce that bit of quality that would get us back in the game."