Tim Barker's "Error, the Unforseen, and the Emergent: The Error and Interactive Media Art" discusses (as you can probably guess from that title) the productive role of glitches in interactive media:

Rather than thinking of an event as the process by which preformed or preconceived possible information becomes realised, we can only think of an error as coming into being as the unformed and the unforeseen potential is actualised. This potential emerges from unique activities that occur in the process of a system. These unique activities open the system so that unforeseen information may emerge (DeLanda, Intensive Science and Virtual Philosophy 36-37). If a system runs through its process without the potential for error it is essentially closed. It does not allow the potentiality of the emergent or the unforeseen. It is only through allowing the capacity for potential errors that we may provide the opportunity to think the unthought, to become-other, and to hence initiate further unforeseen becomings in the virtual (Rodowick 201). In a sense, when there is potential for an error to emerge in a system, the system cannot be regarded as a pre-formed linear progress; rather, it can only be thought as a divergent process that actualises elements of the virtual.

[via Remix Theory]