Recently there has been interest in understanding the coupling of the Tevatron. In particular it was noticed that the strength of the skew quad correction circuit, T:SQ, was operating at a much larger current at flattop energies than when the Tevatron was first commissioned. This memo contains a collection of notes, formulas, and calculations regarding the quadrupole fields in the Tevatron and in particular is meant to document the present settings of the skew quadrupole circuits in the Tevatron at 150 GeV and relate these to the amount of coupling in the Tevatron. We also comment on the magnitude of the skew quadrupole component in the Tevatron dipoles (the a1 multipole component) that would be needed to explain the present strength of the skew quad correctors.