Picket Fences to Third Watch

Chicago Hope's Jeffrey Geiger treated Picket Fences' Douglas Wambaugh who came to Chicago with Jill Brock (also of Picket Fences)

A reporter on Chicago Hope talked to Dr. Austin about having been accepted into the space program and mentions an ER doctor from County was also accepted. In a separate episode of ER Dr. Greene was accepted in the space program.

ER's Dr. Lewis went to New York to look for here sister and was aided by the characters of Thrid Watch.