Several studies using word lists have tried to see if informing participants of false recall would make them less likely to form false memories, results are a little mixed:

> 1) Although subjects were not able to perform accurately under these
> conditions, the warning instruction did attenuate the false
> recognition effect. This
> illusion of memory appears to be remarkably robust and little affected
> by the instructional manipulations.
> 
> 2) forewarning did not eliminate the false recognition effect, as
> these subjects and those in the other groups made numerous false
> recognitions in this task.
> 
> 3) When a warning about false recall was provided, young adults virtually eliminated false recall by the second trial. Even though old adults also used warnings to reduce false recall on Trial 1, they were unable to decrease false memories across the remaining four study–test trials. Old adults
also reduced false recall more with slower presentation rates. These findings suggest that old adults have a breakdown in spontaneous, self-initiated source monitoring as reflected by little change in false recall across study–test trials but a preserved ability to use warnings and slow presentation rates to reduce false memories.

References:

1) McDermott, K. B., & Roediger, H. L. (1998). Attempting to avoid illusory memories: Robust false recognition of associates persists under conditions of explicit warnings and immediate testing. Journal of Memory and Language, 39(3), 508-520.

2) Gallo, D. A., Roberts, M. J., & Seamon, J. G. (1997). Remembering words not presented in lists: Can we avoid creating false memories?. Psychonomic Bulletin & Review, 4(2), 271-276.

3) Watson, J. M., Mcdermott, K. B., & Balota, D. A. (2004). Attempting to avoid false memories in the Deese/Roediger—McDermott paradigm: Assessing the combined influence of practice and warnings in young and old adults. Memory & Cognition, 32(1), 135-141.