Lost in Yonkers marks Neil Simon's transition from a purely comic writer to the more mature playwright he would become in the 1990s. After Lost in Yonkers, he would go on to write several additional plays, including The Goodbye Girl, Proposals, and Rose's Dilemma. He also wrote two memoirs in 1996 and 1999 title Rewrites and The Play Goes On.
You might also consider looking at the plays of some of Simon's contemporaries, including David Hare, Alan Ayckbourn, Adrienne Kennedy, and Caryl Churchill, whose theatrical works were all significantly different from Simon's. What do these contrasts say about the era?