I'm curious to know what's considered a "garbage TD", because looking at the numbers, it's not clear that Manning was inflating his numbers because of them. I charted the time and score difference when each TD pass was thrown, here are the facts...
Score difference is the difference in the current score, either leading or trailing, before the TD is thrown
Manning
30 Total Passing TDs
TDs thrown, 0-7 score diff: 22 (73.3%)
TDs thrown, 8-14 score diff, pre-4th quarter: 3 (10%)
TDs thrown, 8-14 score diff, 4th quarter: 3 (10%)
TDs thrown, over 14 score diff: 2 (6.7%)
By quarter
1st: 9 (30%)
2nd: 8 (26.7%)
3rd: 5 (16.7%)
4th: 8 (26.7%)
Stafford
22 Total Passing TDs
TDs thrown, 0-7 score diff: 13 (59.1%)
TDs thrown, 8-14 score diff, pre-4th quarter: 4 (18.2%)
TDs thrown, 8-14 score diff, 4th quarter: 3 (13.6%)
TDs thrown, over 14 score diff: 2 (9.1%)
By quarter
1st: 6 (27.3%)
2nd: 6 (27.3%)
3rd: 4 (18.2%)
4th: 6 (27.3%)
Looking at each TD, I did a little bit of subjective analysis on whether it would be considered a "garbage TD", which I define as a TD thrown with a huge score difference (over 2 TDs), or late in a game at a moderate score difference (around 2 TDs).
Manning
Not Garbage: 19
Probably Not: 3
Maybe: 4
Probably Yes: 1
Yes: 3
I will leave the Yes and Probably Yes ones up for debate
Probably Yes
Week 4: To Fells, Mid 3rd, up 10
Yes
Week 3: To Fells, Mid 4th, up 10
Week 9: To Donnell, Mid 4th, down 30
Week 9: To Washington, Late 4th, down 23
Stafford
Not Garbage: 15
Probably Not: 3
Maybe: 0
Probably Yes: 2
Yes: 2
I will leave the Yes and Probably Yes ones up for debate
Probably Yes
Week 8: To Tate, Mid 3rd, down 18
Week 14: To Fauria, Late 3rd, up 10
Yes
Week 14: To Bell, Mid 4th, up 10
Week 17: To Riddick, Late 4th, down 16
To be quite honest, I don't think either QB was guilty of padding by way of garbage TD. For yards, I'm not sure...I didn't look at garbage yards because frankly I don't care about passing yards at all.