Services researchers are coming to appreciate how enriched interventions can be easily contaminated by local variations in usual treatment. Efforts to address this problem require a clear and detailed account of treatment as usual, but the authors described it only as including medication, psychoeducation, case management, and supportive psychotherapy. They did not describe which outpatient services were provided at either patient or agency levels. When the study was conducted, services available to public mental health consumers in Connecticut included cognitive-behavioral therapy, assertive community treatment-level case management, illness management and recovery, and individual placement and support. Interventions at specific levels of care included medication delivery, money management, and on-site supervision. Consumers in the study also may have been receiving system-sponsored peer mentor services. Who was receiving what, and with what effects? Who benefited most from the intervention? The authors proposed that the peer companion enrichment may affect patient engagement, but their report did not include proximal outcome measures of engagement, alliance, adherence, satisfaction, symptom severity, functioning, or goal attainment.