I'm sure I'm duplicating a few from trystero's comprehensive lists (amazing work, trystero!), please excuse any duplicates I miss:
Page 95 - Traps: "slow-down the heroes" should be "slow down the heroes" or "slow the heroes down"
Page 101 - Sidebar: "once thought extinct Coelacanth" might perhaps need hyphenation, "once-thought-extinct Coelacanth"?
Pages 100, 103, 104, 109, 110, 113, - the "'30s Slang" is fun and will add great colour to pulp adventures, but might better be characterized and titled as "Pulp '30s Slang"? (I've a feeling much of this slang was rarely used outside of a small portion of criminal subcultures, and perhaps only saw most of its use in pulp crime/detective stories.)
104 - Sidebar: "Hard boiled" should be "Hard-boiled" or "Hardboiled"
106 - "Ma" Barker and Sons: "down a stripe of American from" should be "down a stripe of America, from" (remove n from American)
110 - Sidebar: "Rot gut" should be "Rot-gut" or, more commonly, "Rotgut"
110 - Sidebar: "Low quality alcohol" should be "Low-quality alcohol"
110 - Sidebar: "Run down part" should be "Run-down part"
110 - Sidebar: "Well dressed" should be "Well-dressed"
117 - The Spanish Civil War: "well organized" should be "well-organized"
119 - Another Night in Arkham: "university student's rich daddy's" should be "university students' rich daddies"
119 - Another Night in Arkham: "8-guage slug" should be "8-gauge slug"
119 - Another Night in Arkham: "could fit through and" should be "could fit through, and"
121 - "Fleet Footed" should be either "Fleet-footed" or "Fleet Foot"
121 - "Strong Willed" should be either "Strong-willed or "Strong Will"
123 - The Jade Emperor: "scheme seems certain" should, perhaps, be "scheme seems uncertain"?
124 - Professor Cobalt: "Armor: none, while" should be "Armor: none; while"
125 - The Goop: "up and coming" should be "up-and-coming"
125 - The Goop: "watch repairer, called Mr. Sparks was in fact," should be "watch repairer called Mr. Sparks was, in fact,"
128 - Sidebar, Bind Enemy: there is an extra, apparently unneeded bullet point
130 - The Raven, Pulp Talents: "Heavy Hitter;" should be "Heavy Hitter:", bold, and start on a new line.
131 - "Captain" Caleb Lusk, Pulp Talents: "Fleet Footed;" should be "Fleet-footed:" (or "Fleet Foot:"), bold, and start on a new line.
133 - Malevolent Spirit: "interact with physical word" should be "interact with the physical world"
133 - Malevolent Spirit: The Malevolent Spirit's spells or attacks seem like they should include something about possession?