Day 4 was consumed entirely by contentious pre-trial motions, with opening statements postponed to the following day. The defense blindsided prosecutors with a supplemental witness list of 34 names and undisclosed materials submitted on the morning opening statements were supposed to begin. The court worked through numerous exhibit disputes, ruled on the defense's controversial motion for Simpson to physically demonstrate knee limitations, and addressed discovery quarrels over evidence handling and Detective Fuhrman's impeachment rights. The jury was finally brought in late in the day for pre-instructions only.

• Defense submitted 34-name supplemental witness list with undisclosed materials on morning opening statements were scheduled, many witnesses unvetted
• Prosecution and defense clashed over Simpson's proposed physical demonstration of knee scars and limitations to jury
• Judge Ito sustained objections to pheno test photographs but overruled objections to crime scene evidence photos P-35 and P-44
• Prosecution objected to 20+ defense exhibit boards and visual aids, with judge sustaining objections to calendar and sock timeline
• Judge confirmed defense has constitutional right to cross-examine Detective Fuhrman on racial bias and animosity
• Judge Ito issued formal courtroom conduct order establishing ground rules for audience behavior and trial procedures
• DNA discovery dispute emerged regarding autorads and slot blots never provided to defense
• Jury brought in late in proceedings for pre-instructions; opening statements delayed to following morning