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The "syringe" Irving uses to inject himself with the Dominant Species Plaga is quite strange, as it is an air-injector, compared to more conventional syringes (and does not have a needle).
As revealed in a diary entry written by Oswell E. Spencer's butler, Patrick, Irving had connections to a "female spy" who knew Albert Wesker. The spy is most likely Ada Wong.
When viewed in the figurines section of the Library, a reflection of a tropical island can be seen in Ricardo's glasses.
Irving has two Figurines modeled after him. One is figure No.07 called Irving which is made available by collecting 10 B.S.A.A. Emblem and completing Chapter 2 and costs 500 Exchange Points. This is Irving an human form and his Voice is shouting "Over heeeere!". His second figure is No.42 called Irving (Transformed) which is made available by collecting 5 B.S.A.A. Emblems and completing Chapter 3 and costs 500 Exchange Points. This is Irving in his mutated form and his Voice is him roaring.