In which film is Carl Spackler a character?

In which film is Elliott a character? Who played Gertie in 'E.T. the Extra-Terrestrial'? In which film is Gertie a character? Who played Carl Spackler in 'Caddyshack'? Who played Ty Webb in 'Caddyshack'? Who played John "Bluto" Blutarsky in 'Animal House'? In which film is John "Bluto" Blutarsky a character? Who played Jake Blues in 'The Blues Brothers'?