When Jim (James Garner) is eating 'greasy' chicken with Mr. Bannister ('Warner Anderson) - after Mr. Bannister has said; 'and she has refused to do so', and Jim replied, 'right again' - the next 4 words - supposedly from Mr. Bannister ('all right, Mr. Rockford') are looped ('dubbed') by someone else - someone who doesn't sound anything alike.
In the opening pan of Rockford's desk while the answering machine is playing, you can see someone resting their left hand on their leg (wearing boot cut blue jeans and cowboy boots) between the picture of Rocky and the close up of the telephone.