Well, I checked my "Lost in Boston" tapes, and they have no liner notes about the songs. They just indicate what shows they were from, who sings them, and production credits.
The demo recordings for Promises, Promises from the "Broadway First Take, Vol. 2" CD has some notes:
1) Promises, Promises - Rose Maire Jun & Kenny Karen - This is the show's final song, although first in this program. It is the hollow promise of career advancement that sets the ironic tone of the musical. Like much Bacharach/David work, the shifting rhythmic accents provide enormous energy.
2) What Am I Doing Here? - Rose Marie Jun - Cut from the score, perhaps becuse of a preponderance of ballads. A beautiful ballad, it is sung here with moving introspection by Rose Marie Jun. It questions why this intelligetn woman continues in a futile affair with a married man. She asks herself, "When am I ever gonna learn?"
3) Upstairs - Kenny Karen (who gleaned this interpretation directly from Burt Bacharach) - With his"U-u-u-u-pstairs" slide and his youthful vigor, this performance actually has more of the joyous feeling of the hero, Chuck, than Jerry Orbach's stage performance.
4) You'll Think of Someone - Rose Marie Jun & Bernie Knee - A tenuous duet. Chuck is trying to interest Fran in sharing interests and hobbies with him but she is oblivious to him. The song is a trenchant comment on non-communication.
5) She Likes Basketball - Kenny Karen - An optimistic jazz waltz, the kind of song in which Bacharach/David have no peers. On the line where he dribbles right down the court and shoots for the basket, you can almost feel him take off from the floor.
6) Let's Pretend We're Grown Up - Rose Marie Jun & Leslie Miller - Cut from the score and as far as I know, never recorded. Intended for the office party scene that ends Act 1 (subsequently ended by "Turkey Lurkey Time"). It shows girls' mixed emotions towards boys as something stemming from childhood. Something they only expose when they are tipsy.
7) Wanting Things - Kenny Karen - In his opera, Tosca, Puccini gave the most passionate music to the villain, Scarpia. So it is here, for Sheldrake, a lying cad, is given this song, performed here with such feeling by Kenny Karen. The song really helps the believability of the musical, for it gives this bounder a third dimension, fleshing out his character.

Tick Tock Goes the Clock - Burt Bacharach, Rose Marie Jun & Leslie Miller - Cut from the show. Several trenchant messages are chouched in this rhythmic, light-hearted song about time for marriage slipping away. The cruelty of conformity is beautifully stated in this lyric, which Hal David called his "favorite song in the show." Burt Bacharach joins in the singing of the nonsense syllables between the choruses and at the opening.
9) Whoever You Are I Love You - Rose Marie Jun - This seminal number, somewhat like an art song, has enough exquisite phrases for three songs. Jun delivers a performance of poignancy and power. Beginning and ending with a haunting, "Sometimes your eyes look blue to me," crescendoing with "from moment to moment" and climaxing on "whoever you are, I love you," this is one of the finest and most moving show songs of the decade.
10) Christmas Day - the ensemble - Sung in the show by half a dozen choristers in the pit. It was intended as a pastiche, with lyrics such as :Learn to give/try to live/each day like Christmas day." It has a moving noel-like melody that adds to the variety of the score.
That's all I could find in the way of notes on these songs. Steve