I noticed some dots and lines on the Boeing 747 engine pylons. What are they?
The above image is as seen in this video at 2:18.
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6$\begingroup$ The linear objects are the strut aft fairing panel latches. The panels hinge along the dark horizontal line seen in your photo. There is an engine support strut beneath the panels. There are also hydraulic system components contained in that compartment. $\endgroup$ – Porcupine911 Mar 19 '16 at 19:28
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These are latches holding the engine support pylon panel in closed. Behind this panel is the diagonal brace.
This area was modified ~1992 due to the El Al Flight 1862 and China Airlines Flight 358 crashes.
See FAA Lessons Learned (via archive.is).
