This issue is a variant of Batman (DC, 1940 series) #397.
Some copies contain a 12 page insert for the Mask comic series.
On sale date from Meanwhile column in Secret Origins (DC, 1986 series) #4 "(Week of...)".
Color credits confirmed by Anthony Tollin.
Story continues in Detective Comics #564. Story title from Ralf H. Kienzle on 12 September 2004 (confirmed by Matthew Z. Head on 19 September 2004). Was previously "Box-Office Smash."