On the DVD, no Spanish language track is available.
This is the first episode in which it's shown that Hank and Bobby are aware that Peggy's Spanish is far from fluent. In previous episodes, notably the Pilot, Hank doesn't seem to notice her poor pronouciation.
When Peggy speaks Spanish at the trial, one of the things she says is something like "I have too many anuses ahead of me to end up in a cigar factory." This is because in Spanish, the words for "anus" and the word for "years" are almost identical, a tilde being the only difference.