* In Chapter 91, the "Forty Days" is referred to as an annual fast.ref This corresponds to the Christian tradition of fasting for forty days in [[Lent]]; a practice that is not witnessed earlier than the [[First Council of Nicaea|Council of Nicaea]] (325). Nor is there a forty days' fast in Judaism of the period (see [[Mishnah]][[Ta'anit (tractate)|]], "Days of Fasting").
* Where the Gospel of Barnabas includes quotations from the [[Old Testament]], these correspond to readings as found in the Latin [[Vulgate]];ref rather than as found in either the Greek [[Septuagint]], or the Hebrew [[Masoretic Text]]. However, it should be noted that the Latin Vulgate translation was a work that [[St. Jerome]] began in 382 AD, centuries after the death of Barnabas.
*In Chapter 54 it says: "For he would get in change a piece of gold must have sixty mites" (Italian minuti). In the New Testament period, the only golden coin, the [[aureus]], was worth approximately 3,200 of the smallest bronze coin, the [[Greek lepton|lepton]] (translated into Latin as minuti); while the Roman standard silver coin, the [[denarius]], was worth 128 leptons. The rate of exchange of 1:60 implied in the Gospel of Barnabas was, however, a commonplace of late medieval interpretation of the counterpart passage in the canonical Gospels (Mark 12:42), arising from the standard medieval understanding of minuti as meaning 'a sixtieth part'.
* Chapter 91 records three contending Jewish armies 200,000 strong at , totaling 600,000 men, at a time when the Roman army across the entire Empire had a total strength estimated as 300,000.
* In Chapter 119 Jesus instances sugar and gold as substances of equivalent rarity and value. Although the properties of [[sugar]] had been known in India in antiquity, [[History of sugar|it was not traded as a sweetener until industrial-scale production developed in the 6th century]]. From the 11th to 15th centuries, the sugar trade into Europe was an Arab monopoly, and its value was often compared with gold. From the mid-15th century, however, large scale sugar estates were established in the [[Canary Islands]] and the [[Azores]], and sugar, although still a luxury item, ceased to be exceptionally rare.
