B737-800
Distraction; Situational Awareness
Deviation - Altitude Overshoot; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Environment - Non Weather Related; Human Factors; Procedure
While descending on the CLASH Arrival just prior to EVRLY we encountered a wake turbulence event 2x in short succession with roll deviation. Autopilot disconnected; was immediately reconnected by the Captain (PF). He disconnected VNAV and initiated Vertical Speed mode to reset our descent path to be slightly above the previous aircraft path; to prevent a third event. About this time; ATC offered us a runway change from 35R to 35L; additionally they requested us to slow to 210 kts. The Captain went to reprogram the FMS for Runway 35L; I was confirming the Captain inputs at this time. The aircraft was still in Vert Speed rather than VNAV; neither of us noticed this and we descended below the STAR required altitude and did not slow to 210 kts. as directed. A query from ATC as to our speed brought us back to reviewing our flight path; at which point we leveled off and reduced speed. ATC made no further comments as to our flight path deviation and at that point broke us off from the STAR with a vector to intercept the LOC. No loss of ATC separation was reported to us.
B737 First Officer reported speed and altitude deviations on arrival into DEN; citing distraction from a wake turbulence encounter as contributing.