I counted 46 preseason penalties using the NFL Gamebooks, but I did not account for any that were declined. Here's the breakdown:
Holding (Offensive or Defensive)
T.Mitchell (3), K.Lindsey (2), O.Scandrick (2), T. Smith (2), A.Dixon (1), B.Carter (1), C.Boyd (1), D.Free (1), D.Sapp (1), J.Heath (1), J.Najvar (1), J.Wetzel (1), K.Wilber (1), L.Byrd (1), R.Leary (1), R.Patrick (1), R.Smith (1), U.Nwaneri (1), W.Smith (1), Z.Martin (1)
Face Mask
A.Hitchens (1), [player not named] (1)
False Start
J.Hanna (1), S.Goodin (1), T.Benford (1), U.Nwaneri (1)
Horse Collar Tackle
K.Bishop (1)
Illegal Contact
A.Dixon (1), K.Smith (1), T.Mitchell (1)
Illegal Formation
T.Crawford (1)
Illegal Forward Pass
D.Vaughan (1)
Illegal Shift
D.Street (1), [player not named] (1)
Illegal Use of Hands
M.Bernadeau (2), B.Webb (1)
Offensive Pass Interference
T.Williams (1)
Roughing the Passer
G.Selvie (1)
Unnecessary Roughness
A.Dixon (1), T.Patmon (1)