When Dr. Crusher leaves the bridge to go to Engineering, she instructs the turbolift to take her to Deck 36, which is in the ship's secondary hull. However, when she exits the turbolift she immediately runs left and down a wide-diameter circular hall, which would indicate that she was still in the ship's saucer section, far from Engineering.
At one point, Dr. Crusher uses a workstation on the bridge to view the warp bubble with Enterprise superimposed on it. She watches the bubble shrink until it comes perilously close to the main bridge. The next shot shows her worried expression. But when the scene cuts back to the graphic, the bubble has widened again.
When Dr. Crusher is on the bridge and she hears the first explosions, a computer graphic shows the warp bubble collapsing onto the ship and a significant portion of the front of the saucer section having already disappeared. Back in Engineering, La Forge and Data notice that the warp bubble is collapsing at the rate of 15 meters per second and will be completely gone in four and a half minutes. That would make the diameter of the warp bubble 4.050 km (roughly 2.5 miles) at that point. The Enterprise D is only 643 meters (2,100 feet) long. Even without knowing the ship's specs, it is evident that the ship is not four kilometers long.
When Dr. Crusher finally leaves the bridge, she boards a turbolift. When the lift starts to move, the light in the rectangular window goes from top to bottom, indicating that she is moving up, but she boarded the lift from the main bridge on deck 1; there is nothing above the main bridge to go up to.
Flipped shot: At the beginning, as the Enterprise is docking at the star base, the shot cuts to an interior angle; the ship's registry can be seen backwards on the underside of the saucer and on the nacelle pylon.
When all the crew save Crusher and Picard have disappeared, Crusher goes to the bridge and Picard confirms that they are returning to Starbase 133. The viewscreen displays a static starfield. If the ship were warping back to the starbase, the stars should be streaking by.
Dr. Crusher is attempting to "outrun" the collapsing warp field to engineering. At a collapse rate of 15 meters per second, Dr. Crusher would need to run faster than 33 miles per hour, which is well above the fastest recorded time (as of 2020) of 27 1/2 mph.
When Dr. Crusher first encounters the vortex in sickbay, the wind appears to be blowing sheets of paper through the air. But papers aren't used on the Enterprise; everything is done on computer consoles and hand-held devices.
When Dr. Crusher asks Captain Picard, in his ready room, to return to Starbase 133, the captain calls for Riker. Patrick Stewart apparently touches a console off screen, audible, but no chirping noise or other SFX was added. Only the dull sound of the finger tapping the console can be heard.
(at around 32 mins) When Dr. Crusher is alone on the bridge, a boom mic is visible twice in short succession, reflected in the black display behind her.