The phrase "in the seam" can be replaced with a few different synonyms, depending on the context. One option is "embedded," which implies something is situated within or enclosed by something else. Alternatively, "hidden" could work, suggesting that something is not immediately visible or obvious, but situated just out of sight. Another synonym is "between the lines," which denotes that something is hinted at or implied, rather than explicitly stated. Finally, "subtle" could also be used as a synonym, as it implies something delicate, understated, or nuanced-qualities that are often associated with things that are "in the seam."".