A stirring second-half comeback from Nottingham Forest gave them all three points after being a goal down but visiting boss Jackett said: "We can't give goals away like we did.
"The first and the third goals were gifts, which we don't ever get.
"The goals put Forest in a commanding position when we had as much possession and were in a strong position.
"We've conceded three goals in each of our last two away games. If you do that you can't expect to get any points."