At 2:55 it is a normal g. There is just one. Maybe an extra is generated in your mind, as would be needed to correct the error of dropping it, and then you hear

At 2:55 it is a normal g. There is just one. Maybe an extra is generated in your mind, as would be needed to correct the error of dropping it, and then you hear it properly pronounced and count that as a second one. At 6:55 there is something extra, but I don't think it is a g being pronounced. Note that the same word, at 6:51, is lacking that extra sound. It may be an audio glitch or related to a breath he is taking.