Smalltalk was the first dynamic UI environment but within a few years you could do this on lisp machines as well (both the Xerox D machines in either Smalltalk or Interlisp modes and MIT CADR lispms). Which is to say the Smalltalk environment was influential both at the time and later.
If you read the Xerox PARC papers, there was a lot of shared work between the Interlisp-D, Smalltalk and Mesa/Cedar teams.
Actually some of the REPL and debugging features in Mesa/Cedar were done because they wanted to appeal to the Interlisp-D and Smalltalk users, while offering a strong type development environment.
Indeed I worked at PARC (at ISL, using Interlisp) and used all three platforms.
This article was about the '73 Alto implementation though, which preceded the D machines (and preceded my time at PARC by a decade as well). At that time Interlisp was PDP-10 only and had no GUI.
