I have no idea how anyone could have ever spotted this little Easter Egg on the poster for Joe Dante's classic film Gremlins. Lurking in the shadows under the box that Billy is holding with Gizmo is the button of his jeans. On that button is the logo of Steven Spielberg’s Amblin Entertainment production company. You can check it out in the image below.
I have this exact poster, and it's crazy to think that after all of these years there's something on it I never noticed that is a complete and awesome surprise. If you already knew about this, I give you mad props. A big thanks to /Film for pointing this out!