The blond psychiatrist in Two and a Half Men appeared in Frasier, Season 4, Episode 7. Watch it here:
A few episodes earlier, about focus groups, Tony Shaloub also played a part.
Also, Malcolm's (of MITM) mother played a part in Season 4.
The phrase "All is well" appears in Tintin, Cigars of the Pharaoh, page 28.
John Mahoney appeared as Dr. Hanlin in Third Rock from the Sun, Season 1, Episode 8.
Patrick Kerr, who played Leon in Frasier, appeared in Third Rock from the Sun, Season 3, Episode 14, as the guy who approaches Sally in the coffee house.