The "extra" parts of the image are often still a part of the resulting pdf.
If the images are larger than what's being used in the final product, crop them so that only the used portion is actually in the production file.
If the images don't need to be in color, change them to grayscale. If they are CMYK, change to RGB, assuming that color accuracy isn't necessary. If they are high res, you can save them down to low res. If you can get your hands on the original files, then take a look at the images. This will absolutely make it unsuitable for printing at a professional printer. That should bring it down some, assuming, again, that the images aren't already low-res. It'll bring down the resolution of the images to 72 or 96 dpi, depending on your defaults. You can reduce the resolution of the images by doing a file > save as in Adobe Acrobat and optimizing for web usage. Assuming this isn't being printed, then yes, it'll be color images and resolution that are the likely culprit.
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