  We study scalar and vector exchange terms in out-of-time-order correlators
(OTOCs) holographically. By applying a computational method in graviton
exchange, we analyze exponential behaviors in scalar and vector exchange terms
at late times. We show that their exponential behaviors in simple holographic
models are related to pole-skipping points obtained from the near-horizon
equations of motion of scalar and vector fields. Our results are
generalizations of the relation between the graviton exchange effect in OTOCs
and the pole-skipping phenomena of the dual operator, to scalar and vector
fields.
