Justina and Scott both guested in the '96 UPN sitcom
Goode Behavior, starring Sherman "George Jefferson" Hemsley.
Here are the four episodes in which they appear together:
Goode Behavior "The Goode, the Bad, and the Willie"
Goode Behavior "Goode Music"
Goode Behavior "The Only Goode Indian"
Goode Behavior "Goode Angel"
German voice-overs with no subtitles. Sorry.
Here's a compilation clip of Justina's scenes in the live E.R. episode "Ambush"
E.R. - Ambush - West & East coasts broadcasts
And here's a clip of Scott and Justina rehearsing for the E.R. episode "Family Man"
Dave Harris visits Scott Grimes on the set of ER