In Pasquale Orsini and Willy Clarysse's important article “Early New Testament Manuscripts and Their Dates: A Critique of Theological Palaeography” (ETL 88.4 [2012]: 443-474), there is a discrepancy in the date of P.Oxy. 2684 (P78) listed in Table 1 at the end of the article (p. 471): there it is listed as “250-350,” but it should read “400-500,” as described on p. 459.  

The date for this papyrus in the LDAB (#2802) reflects the date in the table, but Prof. Clarysse—who manages the LDAB—has informed me that this will be corrected very soon.