Smeg Ups are bloopers made during production of the series, and feature on t
he DVD releases. There are also entire VHS collections of nothing but Smeg Ups.
The VHS collections are presented by Robert Llewellyn in-character as Kryten, and also included many other extras, such as a performance of Tongue Tied and Kryten answering the 'ten most frequently asked questions about Red Dwarf'.