This is an area of new research for us at TwoMinuteWarning. The original articles on this subject can be found through these links:

Playcalling Predictability
Playcalling League Tendencies

The following table shows the teams from best to worst for week one:

NFL Rush/Pass Predictability

2004	Offense			Defense			Net
Team	Rush	Pass	All	Rush	Pass	All	O-D
MIN	.580	.443	.509	.434	.727	.637	-.128
ATL	.537	.549	.543	.394	.734	.625	-.082
GB	.582	.550	.570	.475	.703	.650	-.080
TEN	.578	.582	.579	.436	.750	.658	-.079
PHI	.631	.530	.573	.475	.730	.637	-.064
DEN	.570	.558	.564	.484	.716	.611	-.047
HOU	.525	.586	.554	.511	.701	.599	-.045
BUF	.548	.633	.584	.495	.706	.628	-.044
NE	.554	.534	.540	.510	.670	.580	-.040
SEA	.618	.571	.598	.450	.716	.626	-.028
ARI	.426	.710	.593	.644	.573	.604	-.011
WAS	.555	.651	.592	.461	.653	.602	-.010
CLE	.534	.626	.576	.455	.664	.584	-.008
CHI	.513	.628	.574	.492	.673	.581	-.007
PIT	.578	.592	.584	.425	.678	.591	-.007
CIN	.479	.714	.596	.617	.577	.598	-.002
NYJ	.617	.577	.598	.479	.714	.596	+.002
DET	.492	.673	.581	.513	.628	.574	+.007
OAK	.425	.678	.591	.578	.592	.584	+.007
BAL	.455	.664	.584	.534	.626	.576	+.008
TB	.461	.653	.602	.555	.651	.592	+.010
STL	.644	.573	.604	.426	.710	.593	+.011
NO	.450	.716	.626	.618	.571	.598	+.028
IND	.510	.670	.580	.554	.534	.540	+.040
JAX	.495	.706	.628	.548	.633	.584	+.044
SD	.511	.701	.599	.525	.586	.554	+.045
KAN	.484	.716	.611	.570	.558	.564	+.047
NYG	.475	.730	.637	.631	.530	.573	+.064
MIA	.436	.750	.658	.578	.582	.579	+.079
CAR	.475	.703	.650	.582	.550	.570	+.080
SF	.394	.734	.625	.537	.549	.543	+.082
DAL	.434	.727	.637	.580	.443	.509	+.128

Then we use these numbers in a currently primitive form to make a line and compare to the actual spread. These predictions are to be treated as EXPERIMENTAL and we do not have enough data yet to expect strong predictive value.