He shows you the commands, at around the 23 minutes mark, looking at what he is saying I think if you do the following it should stop it swimming:
1. Find:
SetSpriteSize (g_sprBackdrop,110,110)
and change I to:
SetSpriteSize (g_sprBackdrop,100,100)
2. Find:
SetSpriteOffset (g_sprBackdrop,5,5)
and change it to:
--SetSpriteOffset (g_sprBackdrop,5,5)
3. Find :
setSpritePosition (g_sprBackdrop, math.cos(g_posBackdropAngle*0.0174)*S, math.sin(g_posBackdropAngle*0.0174)*S)
g_posBackdropAngle = g_posBackdropAngle + 0.02
and change it to:
--setSpritePosition (g_sprBackdrop, math.cos(g_posBackdropAngle*0.0174)*S, math.sin(g_posBackdropAngle*0.0174)*S)
--g_posBackdropAngle = g_posBackdropAngle + 0.02
I think that should work, don't forget to make backups before you edit anything just in case.
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