Hey Barry,
Great lesson as always. Question...when first seeing a tune like this, how do you determine that the E- is Dorian? At first glance would you not think E Aeolian? I say this because the key signature is G major/E minor. Also, the minor ii V i makes you think the E is natural minor. I get that the A 13 to E minor in the song makes you think D major because of the C# and therefore it would be E Dorian. However, the B section ends with a B7 back to the E minor...so wouldn't that make you think Aeolian?
Almost all minor harmony in jazz is dorian. The minor II-V example is the same thing, I would almost always resolve to a dorian sounding I minor chord. The key signature of a tune has no bearing on this, it's all about what sounds good to you and where each chord is headed. Listen to Wes's solo on Jingles, he very typically outlines the sound of E-7 to F#-7 or G major to A major depending on how you look at it. The chord progression is also E-7 A7 which emphasis the C#. Don't let theory get in your way let it support what you think sounds right... Hope that helps -barry