It has been speculated that repetitions and pauses are by-products of covert errors that are detected and repaired before reaching overt speech (Postma & Kolk, 1993). However, remnants of an error may still be identifiable in articulatory movement, if not the acoustic signal. Indeed, perception may not be a reliable indicator of error (Bard & Lickley, 1998; McMillan, Corley, & Lickley, 2009). In this study, EMA data acquired from dialogues recorded in the Edinburgh Speech Production Facility were used to analyze tongue and lip movement at cutoff with respect to the acoustic signal in search of evidence of hidden error.